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Joined: Nov 2001
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ChatMaster - 15,000
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OP
ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 63 |
Fellas,
I have an interesting problem. I am using 10W-30 oil in my '28 Coupe. It has about 15 lbs oil pressure at idle cold and 25+ lbs at higher speeds. The gauge needle is steady as a rock. As the oil heats up the pressures drop to about 5 lbs idle and 15-20 at speed. None of that is the problem. However as the oil heats up the pressure gauge needle begins to slowly vibrate and then when the engine is fully heated vibrates so much you can't tell the high pressure. At idle it is steady. What is the cause? Any ideas?
How Sweet the roar of a Chevy four!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
Gene Schneider
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Joined: Nov 2001
Posts: 29,863
Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
Joined: Nov 2001
Posts: 29,863 |
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Nov 2001
Posts: 19,758 Likes: 63
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 63 |
Didn't think of that but very well could be. Up to late '30 a 1/4" oil line was used which could have air in it. '31 and later used the small oil gauge line which did not have enough volume to oscillate. Will bleed the air out and see if that helps.
How Sweet the roar of a Chevy four!
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Joined: Nov 2001
Posts: 19,758 Likes: 63
ChatMaster - 15,000
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OP
ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 63 |
The gauge worked with the other engine I had in the same car. Will try bleeding the air from the oil line before changing gauges. Thought it might be associated with the oil pump but was hoping for something else as I have pulled the engine too many times to date. Yes you can take off the pan but getting the oil pan gaskets back on so there are no leaks is tough.
How Sweet the roar of a Chevy four!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
At one time we had an oil pressure gauge problem and the fix was to insert a piece if tag wire in the line. May have been a ticking in the gauge. Can't remember for sure.
Gene Schneider
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