My Borg Warner autobox does have some problems. The fluid is up to level and is fairly clean (red). I hope there is someone with a bit more of autobox-knowledge than me (learner on auto gearboxes).
1. There is a screetching noise when accelerating. This happens about half of the time, can be made to disappear when selecting \"2\" so the car only uses gear 1 & 2. Then manually select \"D\". The noise is a metallic noise, like the starter ring hits something. It also happens when accelerating going up a hill (not that we have these a lot here in Holland!).
2. There is too much hesitation in engaging Drive or Reverse from neutral.
3. In a long lefthand fast corner on a motorway, the car loses drive. Back to normal again when on a straight.
Are these problems related? Any tips on what to do?
Many thanks,
Dion Fluttert
1975 2500 TC auto with LPG injection
BW35 problems
Dion,
as most of the Register\'s members seem to need some more time to recover from the National weekend, I\'ll try to help a bit:
Have you checked the ATF level according to the manual (with engine running, after a driving the car to get the fluid on temperature)? Which results always more in guessing than reading the level on the dip stick.
I have had a similar problem (losing drive in sharp bends) and the solution was to fill in another 1/2 litre of ATF (although I thought the ATF level was right, too). I\'ve learned that over-filling is not a problem, anyway. The worst case would be that some ATF could be spill out.
Can\'t help with 1 and 2, though.
Regards
Thorsten
1971 2000 MkII Estate BW35<edited><editID>Thorsten</editID><editDate>38530.4866666667</editDate></edited>
as most of the Register\'s members seem to need some more time to recover from the National weekend, I\'ll try to help a bit:
Have you checked the ATF level according to the manual (with engine running, after a driving the car to get the fluid on temperature)? Which results always more in guessing than reading the level on the dip stick.
I have had a similar problem (losing drive in sharp bends) and the solution was to fill in another 1/2 litre of ATF (although I thought the ATF level was right, too). I\'ve learned that over-filling is not a problem, anyway. The worst case would be that some ATF could be spill out.
Can\'t help with 1 and 2, though.
Regards
Thorsten
1971 2000 MkII Estate BW35<edited><editID>Thorsten</editID><editDate>38530.4866666667</editDate></edited>
- David Withers
- Senior Member
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Dion,
Q1. Under certain loads, the flexplate can flex (!) and allow the starter ring to catch the pinion of the starter motor. This is almost certainly the cause of the screeching and can be cured by inserting a thin plate to bring the starter a bit further away from the flex plate. 2 mm or so should do it. This was an official Triumph modification and dealers kept plates in stock for the job. Perhaps someone on this forum has a spare to save you making one.
Q2. Several things can cause slow engagement of Drive or Reverse but the most common problem <U>by far</U> is low fluid level, hence the need to very carefully check the level with engine running and fluid at normal running temperature. It is very easy to be fooled by the fluid that splashes up onto the dipstick - it\'s an awful system. If you are sure it isn\'t low fluid level, we\'ll have to think again.
What did you mean at the start by \"the oil is fairly clean (red)\"? It should look <U>absolutely</U> clean and translucent red. Any sign of browning indicates trouble within the box from overheating or seal wear.
Q3. I think Thorsten has answered this question very well. I\'ve never considered overfilling in the past but can think of no harm it would cause if done in strict moderation. It might lead to leakage from the tail end of the box but the BW35 boxes tended to leak from here anyway. On the other hand, there should be absolutely no need to overfill.
I suspect Q2 & Q3 are closely related; it\'s too much of a co-incidence for them to be separate problems and the answer which covers both situations is low fluid level.
Regards and best wishes,
David.
Q1. Under certain loads, the flexplate can flex (!) and allow the starter ring to catch the pinion of the starter motor. This is almost certainly the cause of the screeching and can be cured by inserting a thin plate to bring the starter a bit further away from the flex plate. 2 mm or so should do it. This was an official Triumph modification and dealers kept plates in stock for the job. Perhaps someone on this forum has a spare to save you making one.
Q2. Several things can cause slow engagement of Drive or Reverse but the most common problem <U>by far</U> is low fluid level, hence the need to very carefully check the level with engine running and fluid at normal running temperature. It is very easy to be fooled by the fluid that splashes up onto the dipstick - it\'s an awful system. If you are sure it isn\'t low fluid level, we\'ll have to think again.
What did you mean at the start by \"the oil is fairly clean (red)\"? It should look <U>absolutely</U> clean and translucent red. Any sign of browning indicates trouble within the box from overheating or seal wear.
Q3. I think Thorsten has answered this question very well. I\'ve never considered overfilling in the past but can think of no harm it would cause if done in strict moderation. It might lead to leakage from the tail end of the box but the BW35 boxes tended to leak from here anyway. On the other hand, there should be absolutely no need to overfill.
I suspect Q2 & Q3 are closely related; it\'s too much of a co-incidence for them to be separate problems and the answer which covers both situations is low fluid level.
Regards and best wishes,
David.
A short update:
1. I have just now re-read the answer of David. The strange thing is that I did not read it correctly the first time thinking he advised to bring back the flywheel a little. Maybe I got confused by learning of the repair plate of Chris Witor which should be bolted to the original flywheel and which brings the starter ring a bit further away from the starter motor. Anyway, I will first try Davids tip. The exchanging of this will wait then!
2. Both correct! Not enough fluid - the dipstick IS hard to read. Luckily, the fluid is clean and red. Both problems are gone now, thanks!
Dion
1. I have just now re-read the answer of David. The strange thing is that I did not read it correctly the first time thinking he advised to bring back the flywheel a little. Maybe I got confused by learning of the repair plate of Chris Witor which should be bolted to the original flywheel and which brings the starter ring a bit further away from the starter motor. Anyway, I will first try Davids tip. The exchanging of this will wait then!
2. Both correct! Not enough fluid - the dipstick IS hard to read. Luckily, the fluid is clean and red. Both problems are gone now, thanks!
Dion
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