[guy746]

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