Transmission Oil Pumping in Neutral

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03 Jan 2017 16:06 #32208 by alsancle
alsancle created the topic: Transmission Oil Pumping in Neutral
I know this has been covered somewhere but I could not find it. Last night I was reading a Cord 810/812 transmission overview from about 30 years ago and it clearly stated that leaving the car idling in neutral was a bad idea. The transmission oil pump was driven by the wheels turning, so in neutral the oil was not being pumped but some gears were still turning.

My questions are:

1. I this true, leaving the car in neutral and idling means no oil circulation.

2. If it is true, how long of a duration is acceptable, 30 seconds, 1 minute, 5 minutes, etc...


thanks!

A.J.

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03 Jan 2017 16:13 #32209 by RandyEma
RandyEma replied the topic: Transmission Oil Pumping in Neutral
#1 Yes #2 depends on the age of the transmission and how it was rebuilt . If it was set up to tight you are probably going to have problems. R

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03 Jan 2017 16:50 #32210 by alsancle
alsancle replied the topic: Transmission Oil Pumping in Neutral
Randy, that took you almost 13 minutes to answer. I think you are slowing down.
This is related to my dad's 812 that he has owned for 55 years. I would guess that after a couple trips back and forth from Mass to Auburn among years of driving that it would be on the looser side at this point.
Has there ever been tech update with an auxiliary pump or modification to mitigate the problem?

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03 Jan 2017 18:18 #32211 by Tom_Parkinson
Tom_Parkinson replied the topic: Transmission Oil Pumping in Neutral
Hi,
I'm not aware of any published modification, but I have to think that an electric pump could readily be fitted td do the job.
Alternatively, don't idle in neutral unless the clutch is pushed in.
--Tom

With brakes, two cylinders are better than one.

Editor-in-Chief, The Hardtop News Magazine, the Journal of the Michiana Dunes Region, Lambda Car Club International

See pix of 1509A here: http://mbcurl.me/YCSE

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03 Jan 2017 19:50 - 09 May 2017 20:42 #32213 by 1748 S
1748 S replied the topic: Transmission Oil Pumping in Neutral
The truth is unless the wheels are actually turning. there is no oil being pumped thru the trans. Yes, the top shaft does splash some oil but not nearly what is required. Sad part is the gear oil pump was designed to operate off the bottom shaft. This shaft is also the pinion shaft so it must be rotating when the wheels are rolling. Had the oil pump been installed on the top main shaft it would be a better on all the time oil pump The design is the oil is pumped up into the main shaft where it has drilled holes to lubricate the bushing along that shaft. Sadly I did not know any of this and ran my engine probably 4 or 5 hours over the last 40 years. Only one time did I support the front end to see the wheels turning. After that I drove this car about 1/2 mile because I wanted to feel it. No exhaust. No fuel in tank but a gallon can on fender. When I took the trans apart last year I found missing synchro balls and springs but no parts in case. No oil was in the differential or trans either. Someone had replaced the cluster gear with an oem gear and others. But did not "fix" the trans. Glad I took it apart now.... I have not found any burned bushings or damage from running it without oil or the pump running. I believe I got very lucky too and do not recommend anyone doing as I did.
Last Edit: 09 May 2017 20:42 by 1748 S.

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03 Jan 2017 22:48 #32214 by RandyEma
RandyEma replied the topic: Transmission Oil Pumping in Neutral
I have seen lots of different modifications .Are they necessary ????????????????. You decide. R

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