Thomas, I had a similar problem with the overdrive in my BJ8. It would work
normally when the oil was cold, but after it was hot when the gearbox would
shift out of overdrive it would not go back in until the oil was cold again.
I found the internal bore of the aluminum accumulator very gouged and
scarred up. The accumulator has a steel piston in the bore and any debris
that gets into the oil can end up scouring the softer aluminum until the
accumulator can no longer hold pressure when the oil thins out with heat.
I replaced the accumulator, piston rings, and o-rings and my overdrive has
worked great since 1993.
I did not replace the oil pump.
Steve Byers
HBJ8L/36666
BJ8 Registry
Havelock, NC USA
-----Original Message-----
From: healeys-bounces at autox.team.net [mailto:healeys-bounces at
autox.team.net]
On Behalf Of Thomas Willig
Sent: Monday, September 12, 2011 3:10 AM
To: Healey List
Subject: [Healeys] Overdrive slow to engage when hot
Gentlemen,
I am facing the problem that the Overdrive on my BN2 is quite slow to
engage when the gearbox is hot. Here are the symptoms /parameters:
1. I am using Penrite 30 gearbox oil -a non detergent oil
2. I installed a OD pressure gauge that can be read when driving the
car.
3. Gearbox / Engine cold, pressure is 490 Psi -Looks perfect to me
4. OD engages faultlessly
5. Gearbox / Engine warm (Engine Oil 200 F) OD pressure 360 Psi -Too
low.
6. The overdrive needs about 4-5 seconds to engage in other words the
OD pressure takes that long to reach the 360 Psi again.
? Am I facing a worn oil pump? Any advice what I can/should do.
Best regards
Thomas Willig
BN2L-230649 01. Feb. 1956
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