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Briggs & Stratton OHV Intek Hard Starting
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Posted by dreamoftheflood (My Page) on Tue, Apr 15, 08 at 22:17
| I am another of the seemingly many people fighting the hard starting problem with a Briggs & Stratton OHV Intek I/C engine (in my case, a 28N707 15.5 HP model). I have read many posts on the forum about adjusting the valves, and I have adjusted the valves. I have done this many times, but the engine continues to resist starting. I have watched the valves with the cover off, and both valves are moving strongly on their respective strokes. One thing I do not see is any kind of "bump" in the exhaust valve for the compression release. My understanding of the compression release for these engines is that it is driven by the exhaust lobe of the camshaft--that a small bump on the exhaust cam briefly lifts the exhaust valve during the compression stroke to relieve compression pressure. Am I correct? If so, mine isn't doing it. I have even tightened the exhaust rocker down until the exhaust valve is hanging slightly open and then turned the engine by hand. The valve moves strongly during the exhaust stroke, but otherwise not at all. I think this is my problem, but I don't know how to proceed from here.
Any suggestions?
Thanks.
Troy Hunt
Squalor, Austin, Texas
"That government is best which governs least." -- Thomas Jefferson
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Follow-Up Postings:
RE: Briggs & Stratton OHV Intek Hard Starting
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| My 17 hp ELS has been hard starting from the the got go. If I let it set over a couple of days I have to prime it with carb cleaner. I think it is a deaign issue and that's the way it is on mine. |
RE: Briggs & Stratton OHV Intek Hard Starting
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If the valve is properly set with the piston 1/4" past TDC, then you should have negative clearance at TDC.
Insert a .001" smaller feeler gauge than what you set the valves at. It should "pinch down" on the feeler gauge when going through TDC.
I'm not sure if it's always the exhaust valve??? You might check both. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| Follow Bill's note to the letter. If, after that you still have an issue- you will likely need a cam and a gasket set. The cam has also been re-designed. Not common, but it happens. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| some briggs needed a cam, if you set the valves right and you dont get a CR bump of the valve the cam is broken. Back the engine up by had so it gets a full tow reve run up to tdc, or chang ethe cam. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| "One thing I do not see is any kind of "bump" in the exhaust valve for the compression release. My understanding of the compression release for these engines is that it is driven by the exhaust lobe of the camshaft--that a small bump on the exhaust cam briefly lifts the exhaust valve during the compression stroke to relieve compression pressure. Am I correct" NO. The compression release is an arm on the cam gear that keeps the INTAKE valve from closing completely until late into the compression stroke at cranking speeds to relieve some compression. When the engine starts, this arm swings out of the way. In some instances, there is a bur somewhere in the cam arm ass'y that keeps the arm from working, sometimes the spring breaks, sometimes the arm comes off. Some have cam lobe problems but it doesn't sound like yours does. Are you sure you are following proper procedure in adjusting the valves? I have detailed instructions IF you want them. Walt Conner
wconner5 at verizon dot net (put in proper format) |
RE: Briggs & Stratton OHV Intek Hard Starting
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| I would be glad to have the detailed valve adjustment instructions (troy at troyhunt dot net), but I'm pretty certain by now that I have a problem with the compression release. I got out there tonight and put a dial indicator on the tips of both rocker arms and turned the engine by hand. I'm getting no movement whatsoever out of the intake rocker after the primary intake valve event has finished. The intake rocker is stationary throughout the compression stroke, with the intake adjusted with proper lash, and even with the rocker adjustment overtightened so there is no valve lash on the intake at any point. Is there any way this could simply be the result of valve adjustment? If not, can anybody point me to a detailed procedure for removing the camshaft? Please tell me that I won't have to pull this blasted engine again. Thanks. Troy Hunt
Squalor, Austin, Texas
"That government is best which governs least." -- Thomas Jefferson |
RE: Briggs & Stratton OHV Intek Hard Starting
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| would like detail instructions if anybody has them for a b&s 18 hp intek engine. hard cranking unless spark plug is out. |
RE: Briggs & Stratton OHV Intek Hard Starting
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Walt leaves his email address about 3 posts up.
You have to contact him first, so he can just paste them in a reply. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| I have a Cub Cadet ZRT42 mower with an Intek 17hp Briggs motor and had the same problem of hard starting. I read alot of threads trying to find the answer and read severalposts that recommended valve adjusting but I thought my mower ran just fine when I was able to get it started (using an elec drill with a socket on the top flywheel bolt to assist the poor starter)so I blew off adjusting the valves. Bought a brand new starter and stuck it on. SAME PROBLEM! AARRGGHH!!! More searching the internet for the answer. Thought I had a bad compression release mechanism for sure. I saw how easily I could access the valves and decided to go ahead and check them. They needed adjusted alright. I turned both nuts in about a half turn each to get them to .004-.006. I thought, "No way is this the problem", but I reassembled it and hit the key and don't ya know that sucker started up like a new one! I tried it two more times and each time it fired right up. Wish I would have tried the valve adjust before I dropped $84 on a new starter. I have the original starter on now and it's fine. Just F.Y.I. fivestring |
RE: Briggs & Stratton OHV Intek Hard Starting
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I am experiencing the same indications of no compression release on my 14.5 hp ic ohv engine. A repairman had suggested this was the problem some time ago when I had to buy a starter relay which had fried.
Can the valves on my engine be adjusted?
What is the procedure?
Where is the cam located so I can inspect it?
Any help will be appreciated. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| For instructions of adjusting valves, see my post above. You have to remove the oil sump to get to the cam shaft but I wouldn't bother that unless you have reason the think a cam lobe is worn. Both valve push rods should move about the same amount when you turn the engine.IF one of them doesn't move or move much, then perhaps bad cam shaft. Walt Conner |
RE: Briggs & Stratton OHV Intek Hard Starting
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| OMG! I had the exact same problem as fivestring but I melted off the neg posts on 2 batteries trying to get it to start, not to mention the 2 weeks of charging batteries, swapping starters and kicking parts across the yard in frustration all because the exhaust valve needed to be tightened 1/4 of a turn. I wonder how many mower repair shops are raping people for new starters and batteries with this 10 second fix here. This is pure BS. It comes as no suprise for briggs & stratton tho. They are just a big corporation now, worried more about the bottom line than quality of the product. Them buying a bankrupt Murray corp is proof of that. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| i just bought a john deere snowblower with a 20m114 type 0133e1 code 080521yd engine from briggs, it had few issues that delear fixed but still not happy. the engine now like pops firework sound when like starting it second time. then it has to crank it a few times for it to turn over. they replaced the cam cause it went in for hard to start hand cable. now i also get a diff noise in muffler after stoped. puff puff sound. could this be bad adjustments? |
RE: Briggs & Stratton OHV Intek Hard Starting
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| It could be the adjustments. I assume that this is under warranty yet. Have them repair it. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| "It comes as no suprise for briggs & stratton tho. They are just a big corporation now, worried more about the bottom line than quality of the product. Them buying a bankrupt Murray corp is proof of that." It always helps if you read the owner's manual. They tell you there to check the valve adjustment once a year. Walt Conner |
RE: Briggs & Stratton OHV Intek Hard Starting
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"They are just a big corporation now, worried more about the bottom line than quality of the product."
Then buy a Tecumseh! OOPS! Apparently TEC didn't watch their "bottom line"! "Them buying a bankrupt Murray corp is proof of that."
Murray owed Briggs a lot of money when they went bankrupt. Briggs simply tried to recover some value in order to watch their "bottom line". Any more "Pearls of Wisdom"? |
RE: Briggs & Stratton OHV Intek Hard Starting
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Can't seem to find the right place to set the valves to get this 14.5 HP Briggs to start. I can how ever get it to start every time by the rocking method, i raise the hood and hit the switch and release the switch after several hits it will overcome the compression problem and fire right up, But it is kinda hard to get someone else to do this and it work for them.So i would love to have the detailed instructions as to how to properly set the valves.
my email is kkillett@juno.com |
RE: Briggs & Stratton OHV Intek Hard Starting
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| And we would love for you to provide the model number and type number of your particular 14.5 HP Briggs engine. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| replaced starter, solenoid, battery, checked all safety switches-all working fine, new relay switch and still cannot get engine to crank up. not even a rev from the starter, just a click when turning on the key. Click comes from solenoid kicking in but no grind to start engine. starter gets very hot after turning key 9 or 10 times trying to get starter to kick in. what in hell is the problem, machine is 3 yeras old. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| It would be a great help if you would provide some real information about the machine in question. Brand of tractor with model number of tractor. Brand of engine with model number and other engine numbers (like "type #" or "spec #"). Have you removed the spark plugs from the engine to see if the starter will spin the engine with plugs out (plugs out means no compression load)? By the starter "getting hot" we can presume that everything right up to the starter is performing "as planned". Removing the plugs and then trying spin the engine with the starter could possibly expel some volume of gasoline out the spark plug holes. This would indicate that the engine was "hydro locked" by gasoline leaking into the cylinders from the fuel system. If this is what you find, DO NOT use the engine until you have changed the engine lube oil and filter and repaired the leaky carburetor and installed an inline fuel cut off valve (and you were expecting a miracle?). Also, if you plan to pursue ANY of the suggestions, please create a new thread of your own so it is easier to focus on your issue alone. Thanks. |
RE: Briggs & Stratton OHV I/C 19hp
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How do you set the vavles on a 19hp I/C Briggs
What gap and do it hot or cold
and what is the plug gap
mod#...E1N807
Type#...0440-E1
Code#...051024ZE |
RE: Briggs & Stratton OHV Intek Hard Starting
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E=3
31N807-0440-E1, Spark plug gap .030", Valves: Intake .004", Exhaust .006". If you do not know the correct method for adjusting Briggs valves, you will need to get that info before attempting the valve adjustment. You can e-mail me for some instructions if you like. |
Here is a link that might be useful: 31N807-0440-E1
RE: Briggs & Stratton OHV Intek Hard Starting
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Thanks to mownie.....
I got them set and it is running and starting good again. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| Good news A-1 Skyraider, thanks for the hollerback and you're welcome. |
RE: Briggs & Stratton OHV Intek Hard Starting
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| Need help finding the procedure and specs to adjust my valve timing. Did it a few months ago, but lost the web site link. '98 MTD Yard Machine lawn tractor, 14.5 hp 42" cut. Model 13AM675G372 Serial #: 1H248C30027-544823 |
RE: Briggs & Stratton OHV Intek Hard Starting
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| ern, please post the engine model number and type number from the engine. Then we can respond with accurate information. |
RE: Briggs & Stratton OHV Intek Hard Starting
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Model 13AM675G372
Ser 1H248C30027 5444823 |
RE: Briggs & Stratton OHV Intek Hard Starting
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ernest, you have found the EPA emmissions certificate decal. The Briggs model and type numbers will be something like the two photo examples I have posted here.
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RE: Briggs & Stratton OHV Intek Hard Starting
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Sorry, been out of town. Found the numbers I think:
Model: 287707
Type: 1224-E1
Code: 980807Z0 Appreciate the help. |
RE: Briggs & Stratton OHV Intek Hard Starting
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Intake valve sets at .005", exhaust sets at .007".
Here is my procedure for adjusting the valves (or I should say for getting the engine turned to the correct position for adjusting them).
It's pretty long winded but it is bullet proof. I know your engine is a single cylinder, makes no difference, the procedure works for singles or V twins.
Briggs & Stratton OHV adjustment.
Your engine may have more than one cylinder. No problem, just treat each cylinder as if it was the only cylinder on the engine.
Remove the spark plug from each cylinder. You will adjust BOTH valves on "the same cylinder", ONLY AFTER THAT CYLINDER has been positioned to the proper point in the 4-stroke cycle. Remove the valve cover from both cylinders. Identify each valve as INTAKE valve or EXHAUST valve by doing a visual reference. The INTAKE valve will be physically closest to where the intake manifold connects to the head and the EXHAUST valve will be nearest to where the exhaust manifold connects to the head. Next you need to determine which direction the engine rotates when running. You can determine this by spinning the engine with the starter while watching the flywheel rotate through the fan shroud screen. Mark the direction with an arrow (at least on a sketch if not on the engine). Once you have determined the direction of rotation, you can proceed to positioning the engine for valve adjustment. You should turn the engine by hand a few complete revolutions to familiarize yourself with the sequence of valve movements through the entire 4 stroke cycle. It requires two complete revolutions of the crankshaft (720 degrees of crankshaft rotation) to complete one "4 stroke cycle". The 4 strokes of a four cycle engine are (and in this sequence): (1) INTAKE STROKE (2) COMPRESSION STROKE (3) POWER STROKE (4) EXHAUST STROKE. The compression stroke is the stroke where you perform the valve adjustments. Before we try to figure out how to identify the compression stroke for a specific cylinder let's describe the movements of the valves and the terms used: When a pushrod is RISING and LIFTING a rocker arm, the rocker arm will be pushing a valve DOWN. When a valve is DOWN, it is OPEN. When a valve is UP, it is CLOSED.
All the terms (UP, DOWN, RISING) are in reference to the surface of the head where the valve springs touch the head, AS IF....the cylinder was oriented vertically. So, even if the engine is a Single cylinder, or a V-Twin, vertical or horizontal crankshaft.........., does not matter.
OK, turn the engine by hand in the correct direction of rotation while watching both valves of the cylinder you are going to adjust the valves on. When you get to a point in the turning where the INTAKE VALVE begins to RISE UP (closing) and the exhaust valve is already UP (closed), you are in the beginning of the COMPRESSION STROKE. At this time you need to insert a wooden pencil or a wooden dowel rod straight into the spark plug hole until it contacts the piston. Hold the dowel firmly against the piston with one hand and resume turning the engine with the other hand. Observe how the piston pushes the dowel out of the plug hole as the piston moves toward the point known as Top Dead Center (TDC). At the point where the dowel movement stops, mark the dowel flush with the edge of the plug hole. Now, measure upward 1/4 inch from that mark and put a second mark. Put the dowel back in the hole, firmly against the piston and slowly resume turning the engine (in the direction of rotatation) and you will see the dowel move into the hole as the piston drops. Continue turning the engine until the second mark on the dowel is flush with the edge of the spark plug hole. This cylinder is now in the correct position for adjusting the valves ON THIS CYLINDER ONLY. After adjusting the valves on this cylinder, you will need to repeat the entire procedure to get the opposite cylinder into position to adjust its valves. |
RE: Briggs & Stratton OHV Intek Hard Starting
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