Transmission Woes
10-17-2003, 02:31 AM
#1
Instructor
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Transmission Woes
Car:
1981 928 with around 100,000K (15K on a rebuilt engine).
Scenario:
Driving on city streets, at about 30mph, when the transmission gradually stopped responding to rpm input from the engine. It came to a complete hault and felt as though the gearbox locked into place as it would not roll even in neutral. There was a line of fluid 3 city blocks long behind the car.
There was transmission fluid all over the radiator area and looked to be leaking from the front passenger-side of the engine, by the radiator. Engine runs strong and fine.
Interestingly, the car rolled off of the flatbed it was towed home on as though it popped out of the locked-gear position.
Is the tranmission cooler up in that area? Possibly a blown hose?
Any ideas and input would be appreciated.
1981 928 with around 100,000K (15K on a rebuilt engine).
Scenario:
Driving on city streets, at about 30mph, when the transmission gradually stopped responding to rpm input from the engine. It came to a complete hault and felt as though the gearbox locked into place as it would not roll even in neutral. There was a line of fluid 3 city blocks long behind the car.
There was transmission fluid all over the radiator area and looked to be leaking from the front passenger-side of the engine, by the radiator. Engine runs strong and fine.
Interestingly, the car rolled off of the flatbed it was towed home on as though it popped out of the locked-gear position.
Is the tranmission cooler up in that area? Possibly a blown hose?
Any ideas and input would be appreciated.
10-17-2003, 03:57 AM
#2
Burning Brakes
Join Date: Aug 2001
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Glack,
Sounds 95% like you blew a hose. There's a cooler integrated into the side of the radiator - one hose in, one hose out.
As to the "lock-up" I could only speculate, and it would not be positive. Steve C. would be able to detail the failure mode more completely than I, suffice to say, no fluid is very, very bad.
You MAY have gotten lucky and the "locking" was caused by the fluid loss and attendant loss of pressure in the system causing valves to open and close when they shouldn't have. Get 2 new hoses, one to replace the blown hose, and one to replace the hose that will soon join it's brother in failure. I would also check the hoses back at the transmission itself as it transitions from the hardlines, these are probably not in the best of shape either.
Hoses (relatively) cheap, transmission definately not cheap.
Good Luck,
Greg
Sounds 95% like you blew a hose. There's a cooler integrated into the side of the radiator - one hose in, one hose out.
As to the "lock-up" I could only speculate, and it would not be positive. Steve C. would be able to detail the failure mode more completely than I, suffice to say, no fluid is very, very bad.
You MAY have gotten lucky and the "locking" was caused by the fluid loss and attendant loss of pressure in the system causing valves to open and close when they shouldn't have. Get 2 new hoses, one to replace the blown hose, and one to replace the hose that will soon join it's brother in failure. I would also check the hoses back at the transmission itself as it transitions from the hardlines, these are probably not in the best of shape either.
Hoses (relatively) cheap, transmission definately not cheap.
Good Luck,
Greg
10-17-2003, 10:43 PM
#3
Three Wheelin'
Join Date: May 2001
Location: Hudson Valley NY
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Two possibilities for not rolling in neutral; broken planetary gears or you welded the clutches together from excessive heat, no fluid. Fix the hose Like Greg said, fill the transmission with fluid. When you road test your car if the transmission drops out of any gear when hot; the Transmission is bad. Good luck
Hi Greg,
Well come back
Hi Greg,
Well come back