In regards to 3.4 GM motor, what does "Dis O-Ring" mean?
thx
Dis O-Ring ?
Oct 07, 2007
11 Replies
Dat cud be da ring what look like da O.
... in what context are you asking?
80,000 mile motor of 1995 era burns 1 quart of oil within 1,000 miles; someone suggest its due to the "Dis O-Ring."
Seals the Distributorless Ignition System's leftover hole.
Here's what this page has to say about it...
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One more area to inspect often is the oil pump drive. This is located on the rear (LH) of the motor, under the throttlebody. While almost impossible to see from up top, if it starts leaking oil it will leak oil VERY FAST!!! The oil pump drive is a leftover from the 2.8/3.1 design. It is where the Distributor used to go. With the advent of DIS, the dist is gone, but the gears and oil pump remain. This is sealed with an O-ring alone. On the other side, is a pressurized gallery. When (not if) the O-ring breaks, engine oil will leak under whatever oil pressure is available. In extreme cases, a quart every
100 miles is possible. More bad news: to replace the .29 O-ring, the upper half of the motor must come off. Replacement requires cylinder head removal. Only good part is if this happens, you can replace a bunch of other parts with virtually no labor...it's already apart.
Distributor? Does that particular engine use an O-ring for the dist. seal?
just a guess
nate
Not a distributor but the oil pump drive assembly which is what sits where the distributor did in previous incarnations of the engine. Think GM distributor with all but the bottom 1 1/2 inches cut off and capped.
Uses an o-ring to seal the oil pump drive.
Permanent fix is a new brown O-ring and a flat gasket.
On Mon, 08 Oct 2007 07:58:23 GMT, "MasterBlaster"
Don't know about the 3.4 but on my 3.1 I only had to take off the throttle body and a few other easy parts to replace the o-ring.
There was only one 3.4 in the model year the OP mentioned, to get to the O-ring, the rear cylinder head has to come off. That doesn't mean there isn't a hack fix...
The o-ring I'm talking about is in the intake manifold. I can't see how the head could be in the way of it.
There was only one 3.4 in the model year the OP mentioned, to get to the O-ring, the rear cylinder head has to come off.
More specifically, the 3.4 liter engine offered by GM in the model year mentioned by the original poster was the dual overhead cam engine, the rear cylinder head overhangs the oil pump drive support, you'd only be able to lift it 1/4" _maybe_ before it contacted the cylinder head. 1/4" doesn't even expose the O-ring.
Sounds like a completely different engine, I was specifically talking about the 2.8/3.1 series. The 3.4 sounds like a nightmare of expense to fix a 50cent part.
There was also a pushrod 3.4 in the 2.8/3.1/3.4 series of engines. The DOHC was different, and as you said an utter nightmare. It was also a raging piece of crap.
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