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TO20 compression

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johnintx.

07-03-2003 07:51:49




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I recently purchased a '51 TO 20. It cranks and runs fine but smokes bad like its burning oil. I did a compression check and the lowest reading was 105 and the highest was 115. This seemed ok to me, thinking 90 was ok. I went ahead and put a small amount of oil in each cylinder, and checked it again. All of they readings went up, 130 to 150 which seems it might be rings. Does anyone have any thoughts on this, and what should be the compression,,is it 90? I've ordered the service manual but still waiting for it to arrive.

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James, UK

07-03-2003 08:10:18




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 Re: TO20 compression in reply to johnintx., 07-03-2003 07:51:49  
From what I've read here I think anything around 120 or more is fine. Others have posted a lot less than you have got.

Don't know what engine you have, but the Standard tends to smoke a little with age, as the valve guides get worn - top end/valve chest lubrication was never that brilliant in older designs of engines.

Blue smoke on sudden acceleration, then clearing once the revs settle at speed, will indicate valve guides pretty reliably.

I'd try checking that end out first before changing rings.

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Ray,IN

07-03-2003 08:30:49




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 Re: Re: TO20 compression in reply to James, UK, 07-03-2003 08:10:18  
May I add: The contenential engine is the Z120 = 120ci. 6.5/1 compression, 4cylinder. This calculates to 195psi new, under ideal conditions, with absolutly no leakage. Practically, the working compression is around 140psi in a used engine. The numbers are not as important as the range of them. Cylinder pressures should be with a 20% range. Very low pressure in one or more indicates either rings, valves, gasket leakage, or a combination of these factors. All low numbers indicate a worn out engine that requires a rebuild. I've seen engines carrying 60psi still running-and smoking badly. There's a reason the H. Ferguson engineers specified 30W30 oil in summer and 20W20 in winter. These engines were not designed to use multi-weight oils.

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