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Engine knocks

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Tom

05-06-2002 16:42:40




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I have a '48 B and it has a what sounds like a rod knock but I checked the clearences and I was wondering what the tolerence is on the connecting rod bearings. Thanks.




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Dave K

05-07-2002 13:13:15




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 Re: Engine knocks in reply to Tom, 05-06-2002 16:42:40  
I had a rather unique problem with my 1948 model A which took a while to find. It developed a knock similiar to what you describe. I tried all the usual things, rod and bearing clearences, flywheel, clutch disk etc. Finally started to tear down the engine although it had recently been rebuilt before I bought it. Got the head off and the rods loose from the crank, pulled the pistons, everything okay there. Took the governer apart, all okay. Finally, when I was ready to remove the cam shaft,I discovered that someone had installed the camshaft drive gear on the camshaft with bolts and nuts instead of cap screws. Under certain conditions the camshaft would move slightly with endplay, allowing the nuts on the attaching bolts to hit the side of the crankcase. Removed these bolts, installed capscrews and all was well! Came to find out later that the tractor had been rebuilt by a votech high school class which, apparently, was less than concerned how they put things back together. I went over the whole tractor then and found missing cotter keys, lock washers etc. Fortunatly all the tolerences and mechanical work was just fine. maybe they were in a hurry to finish it up? Anyway, sometimes there are strange things that cause common problems.

Dave

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38-A

05-06-2002 19:27:38




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 Re: Engine knocks in reply to Tom, 05-06-2002 16:42:40  
Check for wrist pin movement. Too much wear can cause knock.



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Tom

05-07-2002 06:54:06




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 Re: Re: Engine knocks in reply to 38-A, 05-06-2002 19:27:38  
Thanks for the info 38-A, I will check that, I want to put new rings in it anyway, and rebuild the head. Thanks



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G-MAN

05-06-2002 17:22:02




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 Re: Engine knocks in reply to Tom, 05-06-2002 16:42:40  
Tom, rod bearing clearance is listed as .002 to .004" in my manual. As always with a two-cylinder knock, check that the flywheel is tight on the crankshaft and the endplay is correct. Does the tractor run alright otherwise? Double check your timing and make sure you don't have a detonation problem (spark knock). Others probably have more ideas for you - this is just what I could come up with off the top of my head. Good luck.

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Tom

05-07-2002 06:51:31




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 Re: Re: Engine knocks in reply to G-MAN, 05-06-2002 17:22:02  
G-Man, my rod clearences are .005" on the #1 cylinder but I did not check #2 yet. The tractor runs decent otherwise, but not perfect, yet. How many pounds of compression should that tractor have? Thanks abunch for the info.



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G-MAN

05-07-2002 16:11:23




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 Re: Re: Re: Engine knocks in reply to Tom, 05-07-2002 06:51:31  
Tom, I don't think I would worry about the .005" clearance - .001" isn't going to be enough to cause a knock. As far as compression pressure goes - Bs from serial number 96000 to 200999 should have 70 psi, and from 201000 and up should have 110 psi (all-fuel tractors in the later range still have 70). I assume your tractor is a gas-burner, so 110 would be correct. If it is a little low (say 95 psi or so), I wouldn't worry too much but maybe consider some engine work if it is using oil, smoking etc. The biggest thing you want to look for is a substantial difference between cylinders. There should be no more than 10% difference between them, or the engine gets harder to tune up because of the imbalance. Good luck with your tractor.

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JD60

05-06-2002 19:17:12




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 Re: Re: Engine knocks in reply to G-MAN, 05-06-2002 17:22:02  
GMAN- Just to add what I have experienced,I have a 60 that has a knock along with vibration once I allow the RPM's to come up...the driving disk is the part to blame with my particular troubles. don't know if this helps any.....



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