Ian,
First off, make sure that your diff is not overfilled. The symptom
(assuming it is coming frm the vent) fits this scenario exactly. Simply
remove the FILL plug with the unit parked on level ground (there's enough
room to get under there without jacking it up), put a pan under the diff and
let the excess drain to the level of the bottom of the fill hole. The shop
may have filled the unit with the vehicle on the hoist and the diff hanging
by the springs, which is not level. If overfilled, the ring gear will throw
excess amounts of oil up and out the vent. I'd check the oil level
regardless, but your idea to test the shop's claim that the oil is coming
from the vent and not from their repair is a good one. Keeps 'em honest!
The extended vent tube is to move the diff vent up for fording so water
won't enter through the vent while the axle is submerged. All diffs have
some sort of a vent, but better 4x4s have extensions like yours.
Good luck!
Jim Allen
------------ >From: cmpdbase@telusplanet.net >To: jimallen@onlinecol.com >Subject: [MV] cucv diff >Date: Wed, Aug 15, 2001, 10:46 PM >
> Listers, > I had both pinion seals replaced on my M1008 cucv. > After the repairs, I thought the rear pinion seal was leaking as there > was gear oil on the springs and shocks on both sides of the differential > housing and on the bottom of the box. My assumption was the gear oil > was being sprayed around as the driveshaft turned. > The owner of the shop that did the work, said that prolonged driving was > building up pressure in the rear end and the gear oil was being forced > out of the vent tube, falling on the rear yoke and being sprayed around > under the box. I told him the maximum speed was 40 mph and the distance > was from my house to his shop. > First, anyone heard of such a pressure buildup? The rear end is a GM > commercial locker with 4.56:1 gear ratio. > Second, for interest sake, why do they have vent tubes on 4x4 > differentials? A 4x2 doesn't have them. > To check the mechanics theory, I am moving the vent tube down by the > frame so any fluid cannot drip onto the yoke. If the pinion seal is > leaking, there should be gear oil present, if not the yoke should be > dry. > Ian > M1008CDN > > > ===Mil-Veh is a member-supported mailing list=== > To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org> > To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org> > To reach a human, contact <ack@mil-veh.org> >
This archive was generated by hypermail 2b29 : Sun Sep 02 2001 - 11:15:39 PDT