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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Help with Cletrac Engine

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Mike

08-06-2003 18:27:43




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Hello,

I just tore down the engine on my Cletrac HG-42 and have a question on how much cylinder wear is too much before I need to have it bored oversize. The clearance between the piston skirt and cylinder is 0.007". Will I be alright with just replacing the rings? Any advice would be appreciated.

Thanks,

Mike




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ajax implement

08-08-2003 09:08:55




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 Re: Help with Cletrac Engine in reply to Mike, 08-06-2003 18:27:43  
You have received some good advice. You never told us if you have an HG with the IXA, IXK or IXB engine. Also you need to look at what kind of money you want to put into this and what parts are available.



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RAB

08-08-2003 06:38:36




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 Re: Help with Cletrac Engine in reply to Mike, 08-06-2003 18:27:43  
Mike,
This is not the whole question, really, is it?
Is the bore worn round or oval. New piston rings will have a job to seat if it is oval.
Is it the piston or bore that is worn? Check bore wear from ring gap when pushed to bottom of bore, then in the ring area. This will give ring wear and bore wear approx.
Are the pistons oval? Is there a prominent ring ridge to remove (or are you intending fitting a stepped top ring?)
Are the piston ring-grooves worn? New rings with too much side clearance in a worn bore could well 'oil-pump'.
you don't say why you tore it down in the first place (burning as much oil as gas?) and if you have found any other damage/problems - such as broken rings, stuck rings, etc
Would you need to further hone the bore before fitting new rings? Honing means bigger bore!
Does the bottom end need doing or how would it stand up with a rebore and new pistons? If it is marginal you may need to consider whether to do the lot at the same time.
Basically, relying on this forum to determine what your engine needs from one single piece of data will, in my opinion, not give you a good answer unless you are simply looking to justify your decision to re-ring it.
If you are not sure, get an expert to examine it.
Regards,RAB

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DaveInMI

08-08-2003 04:12:14




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 Re: Help with Cletrac Engine in reply to Mike, 08-06-2003 18:27:43  
I'd also recomend having the block magnafluxed to check for cracks before putting any money into it.



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RWT

08-07-2003 20:35:45




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 Re: Help with Cletrac Engine in reply to Mike, 08-06-2003 18:27:43  
Where did you measure the bore diameter.

If you measured it at the top of the ring travel then it might not be too bad.

If it was measured farther down it sounds a little loose.

If you don't have a good bore gauge, find someone who does and knows how to use it. I personally don't believe in the feeler gauge method.
The bore gauge can be set to the piston size and you can check a cylinder all over in relative seconds.

RT

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Ollie

08-07-2003 11:22:13




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 Re: Help with Cletrac Engine in reply to Mike, 08-06-2003 18:27:43  
I'd beg, borrow, or steal a service manual to be sure. Can't say on that engine specifically but on most engines that's way out of spec (.001 - .003 is typical). The piston skirt will slap the walls making a lot of noise and the piston will rock in the bore wearing rounded edges on the rings and causing them to both leak compression and burn oil.



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ajax implement

08-07-2003 10:35:33




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 Re: Help with Cletrac Engine in reply to Mike, 08-06-2003 18:27:43  
You did not say if you have cast or aluminum pistons and are you measuring taper or out-of round.



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Larry from MD

08-07-2003 08:52:50




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 Re: Help with Cletrac Engine in reply to Mike, 08-06-2003 18:27:43  
From the book it says use a feeler gauge of .003 and you should have a drag of 3 to 7 pounds when pushed beside the piston.Later it gives piston clearance as .003 to .0035 it doesn't give a maximum.



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Dan-o

08-09-2003 06:08:18




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 Re: Re: Help with Cletrac Engine in reply to Larry from MD, 08-07-2003 08:52:50  
If it were mine, I would bore to the nxt size over. If the cylender is oval this will correct it. This will require new pistons and rings nxt size over. There would be no ridge to worry about at the top (another potential problem solved). All questions about condition of rings are now moot.

... But then ... its just my opinion

dan-o



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