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Join Date: Nov 2002
Posts: 8
any ideas on over heating issue...

This is a contuniation of a older post called "74 rebuild choice."

Car randomly having the oil tempature climb upto 300 degrees... Any ideas

third weekend I have had this 1974 2.7 911... Every single time, at some point the oil tempature climbes upto 300degrees... Not everytime and at really random times...

1st time... drove 3 days around town... Spent 4 hours in MOM&Dada driveway while I was visitng one sunday. On the ride home that night ( about 20 min drive) The oil tempature climbed upto 300degrees, I let it sit for 10 min so I could get it home... Climbed back to 300degrees, let it sit for 3 hours... Started and let it idled, climbed right back to 300 degrees......

Next moarning driving it back to the shop no problem.....

2nd time. Shop looked at it. They let it idle for 2 hours, drove it around... Nothing. Put in a new tempature gauge... ( they did some other work, put in a new gas tank, fixed some rust upfront, new chain tensioners, etc. ) 10 min into driving home the temapture climbed up to 300 degrees again.... Stoped at work to let it sit, started driving it and the tempature dropped down to the normal 220-255 range.... Nothing else for the whole weekend.

3rd time.. The head mech drove it 25 miles. ( I think he took it home one night. ) nothing, I drove it all weekend again. nothing... Drove around for about an hour on the Hwy nothing... stopped for something, jumped in the car 10 min latter the temapture climbed up to 300 degrees.... Unplugged the wire from the sensor and pluged it back in... no change, let it sit for 10 min. The tempature gauge showed that the car was cooling down. So the gauge looked good...

Did I mention they also cleaned the oil cooler cooler of when they where working on the gas tank.

Any ideas... Talked to several people local here and no one has seen this before. I think its a sticky Oil themestat or something...

-Guy

Old 11-10-2002, 06:20 PM
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I would suggest checking your temps with a probe or IR temp gauge. Does your car have an external ( front mounted) oil cooler? If so, do the pipes running to the front get hot?
Old 11-10-2002, 06:43 PM
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"I think its a sticky Oil themestat or something... "

Sounds like it to me too - engine thermostat. Remove and test to verify before replacing. Random parts replacing can get expensive.

Sherwood Lee
http://members.rennlist.org/911pcars
Old 11-10-2002, 07:11 PM
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once you remove it... how would you test the thing????

-guy
Old 11-10-2002, 10:16 PM
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Do a search. The proper testing procedure has been given here before.
Old 11-10-2002, 10:19 PM
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I strongly suggest that you not do ANY more driving in your car until you test your engine-mounted oil thermostat!

You have already seriously endangered the engine by continuing to drive it FAR ABOVE the factory maximum oil temp. of 266° F, and if you don't want to replace an engine with studs pulled out of the magnesium crankcase ... CEASE AND DESIST!!!


The following thread has pics of a thermostat being tested:

engine oil thermostat test photos
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Warren Hall, Jr.

1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
Old 11-10-2002, 10:50 PM
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Thats my feeling, that why when it happens I pull over... ( normally pretty close to home. )

My issue is did the guy before me care about this. ( that if he drove it when it was having this problem... ) That is where the whole rebuild debate came from. I want a reliable car and this one kinda turned out to be a lemion... ( it has been a learning curve... ) Luckly all of the repairs have not come out of my pocket yet, but I think thats ended....

Anyway, can you remove the themastate yourself with out yanking the engine out???

-Guy

Old 11-11-2002, 12:24 AM
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