Replace connecting rod on Briggs 24 HP?

engillisMay 17, 2010

My engine: B&S 24 HP intek, 446677-0463-E1, 330+ hrs

My problem: broken connecting rod

The rod is not only broken, but there is lots of small metal pieces (almost ground). The camshaft is slight bent, and part of the cylinder(?) wall (inside which the rod sits) was broken by the rod.

I've never worked on a small engine before. Should I buy a repair manual and try to replace this rod? If I clean the inside of the engine well, will it matter that a piece of the wall is broken (small, maybe 1 inch sq.)? Will the repair manual's instructions be clear enough for a dummy like me to follow? Just can't afford a new engine right now!

Thanks, O wise community members, for your advice!

Eric G.

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Could be the first thing you want to do is check availability of a rod for this engine. Believe it or not, on some models of this series of engine you had to buy both connecting rods AND crankshaft as a set, NOT just a connecting rod.

Your engine does not sound too promising anyway.

Walt Conner

    Bookmark   May 17, 2010 at 5:21PM
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Thanks for the post. Yes, I can get the rod by itself (and the sump gasket and camshaft). All said and done, about $100 in parts. But will I just be throwing my money away?

    Bookmark   May 17, 2010 at 5:56PM
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I can't tell from here. Very hard to imagine that damage and crankshaft not damaged?

Walt Conner

    Bookmark   May 17, 2010 at 9:15PM
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canguy(British Columbia)

I'm with Walt on this one. The rod seized to the crank causing it to break. Why? Most likely due to lack of lubrication. The other one may be close to failing too, replacing one is a band aid at best. You need to check the crank to be sure it is still round and within wear tolerances.The damaged portion of the cylinder should be dressed with a rotary file to eliminate future stress cracks. If the cam is bent, the bearing surfaces are likely damaged.
A home rebuild may buy some time but unless done properly it will be a waste of time and money.

    Bookmark   May 18, 2010 at 12:10AM
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Hey, I appreciate the advice everyone. I conferred with a pro this morning, and it appears that a rebuild would indeed be risky.

Anyone out there have a 446677-0463-E1 they want to sell??

Eric G.

    Bookmark   May 18, 2010 at 2:59PM
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I thought I would let you know what you would of been in for, since I rebuilt my 18 HP OHV B&S last year.

I knew nothing about rebuilding an engine so it took me about 5 weeks of work. First I got very familiar with the mechanics at 2 John Deere dealerships near me. When one place got pissed off at me for asking so many questions I would go to the other John Deere dealer for awhile until they started getting mad and I would go back to the first JD dealership. I can understand their point of view, since that is their living.

You run into all types of problems, and there is an EXACT order things should be taken apart and put back together. It is very expensive too, you will not only need rods, but pistons and new rings too. Then you have to have the engine block re-honed by a professional. You will also need to replace all the gaskets on the heads, block, and every other place too. Then putting everything back together requires some special tools. The hardest thing is getting the pistons back into the block with the 2 rings, and 4 oil rings in the piston grooves. When you are putting everything back in you need special engine lube on all the parts which makes everything very hard to handle.

To show you how stupid I was, I first started doing it without the engine manual until the service manager at JD had mercy on my poor soul and gave me a copy.
the next stupid thing I did was trying to tighten the bolts back up with a feet/pound torque wrench instead of a inch/pound torque wrench. I almost broke the bolts holding the pistons to the camshaft.

I finally got everything back together and it has worked for the last 5 months so far. It was a lot of work, and EXPENSIVE. Finally it is a gamble since if you do not do everything just right the engine could blow up on you within a few hours of use.

    Bookmark   May 18, 2010 at 7:34PM
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"I almost broke the bolts holding the pistons to the camshaft. "

"I finally got everything back together and it has worked "

Hard to keep from commenting here.

Walt Conner

    Bookmark   May 18, 2010 at 9:36PM
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Hey Eric I happen to come across your post on this site earlier this year. I have the same problem. I was wondering if you may have your blown engine still? I need one connecting rod.



    Bookmark   September 15, 2010 at 10:52PM
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I have a 21 hp briggs that broke a rod. How is the orentation of the 2 rods. I believe they can be put in wrong and the engine may still run.

    Bookmark   April 6, 2012 at 11:15AM
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1. best to start a new thread. this one is several years old.

2. see if a briggs website has a parts list for that engine. if the rod p/n's are the same, prolly interchangeable. if the rod's longitudinal shape is equal about the part's c/l, the rods can prolly be flipped. MHO...

    Bookmark   April 6, 2012 at 12:24PM
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I'd love to see that engine running with the pistons bolted to the

    Bookmark   April 6, 2012 at 11:03PM
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Yeah, i was thinking the same thing, and was going to ask, but thought better of it, and then i saw yer letter, which about covers it-thinking what a waste of money it will be. Those who have to ask a lot of questions about how to bolt the piston rings onto the camshaft, etc, should just buy a new engine and save a lot of time and cash! RJ

    Bookmark   April 7, 2012 at 6:46PM
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