Date: Wed, 11 May 2016 18:49:10 -0700
Reply-To: Jeff Schwaia <vw.doka@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jeff Schwaia <vw.doka@GMAIL.COM>
Subject: Re: Autotranny
In-Reply-To: <BAY405-EAS371AA4028314D13F74FFF99A0730@phx.gbl>
Content-Type: text/plain; charset="utf-8"
It most definitely can! I have a friend you popped a cooling hose on his '88 and decided that it was only a mile to home...
When I checked out his van, it still ran... kinda, but the auto transmission was fried! The squeal it made was unlike anything I've ever heard from an AT. My tranny guy said it was one of the worst looking automatics he's ever taken apart. Pretty much un-rebuildable. Had to buy a core transmission for him to rebuild.
Cheers,
Jeff
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dennis Haynes
Sent: Wednesday, May 11, 2016 6:00 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Autotranny
Did it ever work properly after the engine was replaced? Yes it is possible that an overheated engine can transfer enough heat to the ATF cooler to damage it. The automatic transmission consists of a bunch of hydraulically applied clutches. Not only is hydraulic pressure used to apply the clutches but the valve body also uses fluid pressure to make decisions. Any failed seal or stuck/clogged valve can prevent the works from working! A knowledgeable tranny guy will know who to diagnose one of these units. To isolate a valve body problem from a clutch-piston problem. The valve body can be removed and compressed air can be used in the ports to test the pistons for reverse, forward, direct, and the 2nd gear brake band. The 2nd gear brake band piston can be serviced with the trans in place. Anything else means removal and a teardown. If those test good then you can work with the valve body and the governor. Also it is possible for the direct clutch pack to be burned out. The trans could be shifting but that pack is slipping so bad you don t get the gear change.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers
Sent: Wednesday, May 11, 2016 6:03 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Autotranny
This tranny worked fine when it was parked for the engine change at 118,
000 miles. The valve body had been cleaned and reinstalled with a new filter. It ran well before the engine change. A year later ( due to complications with the engine) it doesn't work. Currently ATF level is to the mark, and fluid is new! This one has me and my mechanic stumped!
John
On May 11, 2016 16:09, "Scott" <SCOTTDANIEL@turbovans.com> wrote:
> If it worked fine before the 12 months of sitting, I would say the
> sitting caused the problem. Seals getting dry and hard and not
> sealing. I would warm it up and drive it around gently at low speed with the shifter in "2"
> to get the tranny up to temperature and then see if it starts to
> engage 3rd. You may also want to try one of those fluid additives.
>
> Does it work fine other than not shifting into 3rd?
>
> I don't think the engine overheating would cause tranny issues.
>
> Edward
>
> On Wed, May 11, 2016 at 11:32 AM, John Rodgers <jrodgers113@gmail.com>
> wrote:
>
>> What would be some causes for the autotranny not to shift into 3rd gear.
>> It
>> worked fine before but has been sitting for 12 months!
>>
>> John
>>
>
>