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#48825 08/09/2005 5:45 AM | Joined: Jul 2005 Posts: 5 Junior Member | | Junior Member Joined: Jul 2005 Posts: 5 | My new '54 1/2 ton is smoking blue pretty badly, its got a 55-57 261 with 235 head on it, new plugs cure the smoking for a couple of days, but they carbon up pretty badly. Could someone tell me what the cylinders should read on a compression tester?
thanks for any help, mike | | |
#48826 08/09/2005 6:13 AM | Joined: Aug 2004 Posts: 90 Member | | Member Joined: Aug 2004 Posts: 90 | Wet or Dry readings?
Dry test first w/ the tester, take your cylinder readings, them squirt wd-40 or ?? to seal the rings better then test again. If the reading improves it's the rings, other wise it's the valve guides.
140.
Gooday
Jim
small wheel moves by fire and rod,
big wheel fires by the grace of god,
everytime that wheel turns round,
bound to cover just a little more ground.
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#48827 08/09/2005 12:43 PM | Joined: Sep 2003 Posts: 343 Member | | Member Joined: Sep 2003 Posts: 343 | When doing a compression check take out all the plugs, disconnect the coil wire, and block the throttle wide open. It sounds like you may be running an overly rich fuel mixture possibly.
1954 GMC 1/2-ton Longbed
1971 Pontiac LeMans Sport
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#48828 08/09/2005 6:14 PM | Joined: Feb 2004 Posts: 29,763 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,763 | What color is the smoke, and does it use oil? Oil smoke is blue, and if the rings are bad, the exhaust will puff smoke after coasting for a distance, and getting back on the gas. Fuel smoke is black, and causes a dark black, sooty deposit on the plugs. Oil fouling is black and greasy, and will form a hard deposit on the electrodes which foul it out.
Is the plug fouling uniform from one cylinder to another, or is one or more plugs getting fouled worse? Fuel fouling generally happens to all the plugs equally.
Edit: I just noticed you said the smoke is blue. If the compression tests low, and rises when oil is put into the cylinders, you need a ring job.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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#48829 08/12/2005 3:51 AM | Joined: Jul 2005 Posts: 5 Junior Member | | Junior Member Joined: Jul 2005 Posts: 5 | I just did the compression test, all cylinders are around the 120 mark. Thanks for the help guys. | | |
#48830 08/12/2005 12:41 PM | Joined: Sep 2003 Posts: 343 Member | | Member Joined: Sep 2003 Posts: 343 | Did you do both the "Wet" and "Dry" compression test? BTW, To do a wet compression test you just need to squirt ~ 1 tsp of oil into the cylinders when you do the compression test.
1954 GMC 1/2-ton Longbed
1971 Pontiac LeMans Sport
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#48831 08/12/2005 10:11 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | You can have good compresion & still have bad oil rings.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
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