PeachParts Mercedes-Benz Forum - View Single Post - 83 240D tranny won't shift past 2nd gear.

dmorrison · #11 07-01-2004, 07:39 PM

Well, talked to the tranny guy at the dealer who does the 123 and older cars.
He feels it is the IP vacuum valve.
The readings I told him about and what I did led him to conclude that.
His advise on the 722.117 tranny was that it did not have a problem with paper gaskets going bad after 1000,000-150,000 miles, as the 722.2and.3 did. It was the reverse band clutch wearing out or failing and causing a cracked tranny housing.

His recommendation is to replace the IP vacuum valve and the 2 air switches on the valve cover. He said that they had seen many a tranny rebuilt or replaced due to a bad IP valve which led some shops to believe the tranny was bad.

The IP valve, due to its critical control of the tranny. He had a shop in SFO and had rebuilt trannys ruined quickly due to a bad IP valve. Their shop included the new valve in all there rebuilds.

The air switches on the valve cover due to them leaking. I put the mityvac on one opening and blocked the 2 remaining openings, The unit would pull air thru the plunger shaft. So he recommended that they be replaced.

If the IP valve fixed the problem and the tranny operated normally. I may have the tranny adjusted and the bands and clutches looked at. If it still gives us any doubts well replace it. He recommended to replace the IP valve especially if you istall a new/rebuilt tranny.

Ive ordered the IPvalve, $162 and the air switches, $36 ea. And I'll keep you guys posted.

He also mentioned that the change of fluid and filter may have caused the problem to come to the surface IF it's an internal problem, governor or valve body. He indicated htey see this quite often. The old worn out tranny can't stand the new fluid and it finally give up.

Dave