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Noise in engine

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RAW in IA
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Noise in engine

Postby RAW in IA » Sat Apr 16, 2005 11:59 am

I have a 53 Cub and it has a knocking noise in the engine under full throttle and fairly light load. I hear it mostly when on the road in high gear going uphill. If I put a load on it it goes away. I no it is not in the transmission (1st/reverse idler does rattle some) but sounds like it is coming from the engine. I am using Syntec blend 10W30 oil and it holds about 30-35 lbs. pressure at full throttle,and about 10 at idle. Any ideas? Thanks, Roger
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RAW in IA
10+ Years
10+ Years
Posts: 115
Joined: Sat Feb 08, 2003 9:44 pm
Zip Code: 50662
Location: Oelwein, IA

Postby RAW in IA » Sat Apr 16, 2005 8:35 pm

You know, I hadn't really thought about it , but I think that is the case.
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John *.?-!.* cub owner
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Postby John *.?-!.* cub owner » Sat Apr 16, 2005 8:39 pm

You are biginning to describe what I suspect to be a bod rod bearing or worn wrist (piston) pin.
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Bigdog
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Postby Bigdog » Sat Apr 16, 2005 8:54 pm

Ditto John, sounds like a wrist pin to me.
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Eugene
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Engine Knocks

Postby Eugene » Sat Apr 16, 2005 9:46 pm

The knock is probably mechanical, since it disappears under heavy load.

There are a couple of other possibilities that will cause a ping/knock. Engine timing off a bit. Weak spark (spark plug/s). Carbon deposits. And on the outside, wrong air fuel mixture. Usually any problems on this list will get worse under load.

Suggest you do a tune up and try some solvent in the fuel system to remove carbon deposits. If that does not solve the problem, tear down time.

Sorry, BOL.

Eugene
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RAW in IA
10+ Years
10+ Years
Posts: 115
Joined: Sat Feb 08, 2003 9:44 pm
Zip Code: 50662
Location: Oelwein, IA

Postby RAW in IA » Sun Apr 17, 2005 9:08 am

Thanks for the info, guys. I was affraid of that. I don't use it a lot,mostly fool around in the summer and plow snow in the winter. I'll have to see if I can round up the money to rebuild it.
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