Over heating 911 3.0 litre
05-23-2011, 10:38 PM
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Over heating 911 3.0 litre
Have a 1977 911 with an 1983 3.0. Replaced the trombone cooler with a Mocal in the right front fender. Never any over heating or oil pressure issues.
Recently having over heating (275 area) and lower than normal oil pressure (20-35psi) when on the freeway. After cooling off and running on the street it stays right around 170-200 in temperature and great oil pressure.
Just started in the last week. Both times from the freeway use.....nursed it home. Once I got onto surface streets.....oil temp cam down and oil pressure came up.
Do I have an oil thermostat issue? If so.....which one????
Recently having over heating (275 area) and lower than normal oil pressure (20-35psi) when on the freeway. After cooling off and running on the street it stays right around 170-200 in temperature and great oil pressure.
Just started in the last week. Both times from the freeway use.....nursed it home. Once I got onto surface streets.....oil temp cam down and oil pressure came up.
Do I have an oil thermostat issue? If so.....which one????
05-24-2011, 04:22 PM
#4
Poseur
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First, throughly troubleshoot it. Sometimes they open late (which means, hardly at all). Sounds like yours is never diverting oil to the front fender cooler. I would simply replace it.
05-24-2011, 11:24 PM
#5
Team Owner
easy enough to put your hand on the external cooler or pipes.. if they are not hot then follow the lines back to the stat housing .. and replace the stat ..
05-25-2011, 11:35 AM
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This what I am figuring is the problem.
Over on Pelican.......most seem to think its a lean fuel mixture as the main oil cooler on the engine should handle the load at freeway speeds.
Can the thermostat be cleaned? rebuilt? or is best to buy a new one?
Over on Pelican.......most seem to think its a lean fuel mixture as the main oil cooler on the engine should handle the load at freeway speeds.
Can the thermostat be cleaned? rebuilt? or is best to buy a new one?
05-25-2011, 01:43 PM
#7
uninformed gas bag
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The over heating could be causing the the drop in OP. This could be the result of the tstat or you might even have a kinked or collapsed hose going to your Mocal. Do you have a temp gun?
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05-26-2011, 09:27 AM
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Got a hold of the 911 Tech guy from PCA.
He feels its the oil pressure relief piston hanging up/stuck.
Pulled it yesterday......and its condition is questionable. Piston did not drop out when I removed the plug. Bore needs a good cleaning. Some build up/spots on the wall.
Am ordering a new piston and spring.....cheap check and try.....with oil change $75
Did look at oil lines......no kinked or collapsed hose going to to the Mocal.
Will put it back together this weekend......and take her for a ride
He feels its the oil pressure relief piston hanging up/stuck.
Pulled it yesterday......and its condition is questionable. Piston did not drop out when I removed the plug. Bore needs a good cleaning. Some build up/spots on the wall.
Am ordering a new piston and spring.....cheap check and try.....with oil change $75
Did look at oil lines......no kinked or collapsed hose going to to the Mocal.
Will put it back together this weekend......and take her for a ride