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willysmjeeps.com :: View topic - m38 operates sometimes in 3 cylinder......why?
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m38 operates sometimes in 3 cylinder......why?

 
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baios
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Joined: Jul 29, 2011
Posts: 135
Location: LAMIA GREECE

PostPosted: Mon Apr 16, 2018 6:43 am    Post subject: m38 operates sometimes in 3 cylinder......why? Reply with quote

Hi my m38 operates sometimes with the 3 cylinders!!!! When it is cold and i fired it up at least 90% it operates with 3cylinders. Then after it warms up it runs ok. Confused I checked the spurk plugs and i saw in one of them oil.... not too much but it was there. i also checked the spurk cables and was ok. After all i take it for a ride and as it works ok then suddenly again 3 cylinders for 10 minutes and then in 4 again!!!!! Shocked Shocked Shocked Shocked

i m confused what is it wrong!!!! A friend told me to make a test compresion and see if all 4 cylinders have the correct presure!!!!!! Confused Confused Confused Confused


What should i chek????? Embarassed Embarassed Crying or Very sad
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mdainsd
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Joined: Oct 20, 2017
Posts: 202

PostPosted: Mon Apr 16, 2018 7:45 am    Post subject: Reply with quote

A compression test is a good start. Also a cylinder leak down test will reveal the condition of the piston rings.

It may be as simple as a tired spark plug. You could switch the oily one with another and see if the problem follows that plug or if the problem stays with the same cylinder.
_________________
2004 M1025, 1952 Dodge M37, 1968 Dodge M615 export ambulance, 1942 MB script, 1948 FrankenJeep CJ2A/M38, 1951 M38, !942 WC-57 Command Car, 1944 WC-51 Weapons Carrier, (2) M1941 Sperry 60" Anti-Aircraft Searchlight, John Deere M-gators.
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4x4M38
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Joined: May 30, 2014
Posts: 2816
Location: Texas Hill Country

PostPosted: Mon Apr 16, 2018 8:46 am    Post subject: Reply with quote

Thatís pretty intermittent.

Also check to see if you have a distributor
cap with a hairline crack, and that your
spark plug wires are not dried out and cracking
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Brian
1950 M38
MC11481
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