Steve Cooper

My 86 951 dipstick tube is blowing oil at the junction of the dipstick tube and the oil pan. This happens primarily under full boost.

I've checked the crankcase vent, it's clear and unobstructed. Also did a leak-down test and compression test that showed the engine to be sound.

My theory on the pissing problem is that I don't have the o-ring that sits between the dipstick tube and the oil pan positoned in the right spot.

???

Question- should the small o-ring fit around the section of the dipstick base that fits in the oilpan opening? Or, should the o-ring be in the oilpan opening, as far down into the opening as possible?

Hope someone here has some good advice. The pissing dipstick base is messy, stinky and frustrating...

Luke

yeah , there is supposed to be an o ring and the tube has 1 bolt holding it down.

Steve Lavigne

The o-ring goes over the dipstick tube. The bolt that holds the tube down is on the intake manifold and is slotted so that you can adjust its position. It should be real easy to get to. Also, it should be mounted so that the tube/o-ring is under compression with the oilpan.

Hopefully once you get this sealed up you won't have your dipstick shooting up or something.

Steve Cooper

Steve and Luke, Thanks for the input. I just installed a new O-ring, around the base of the dipstick tube, and hopefully that will solve the problem. I noticed that I had been mounting the flange of the dipstick tube to the front side of the intake manifold. It fits better on the backside. So I fastened it on the backside, where there is a milled surface. I have a hunch that the dipstick was at a slght angle from mounting it to the front of the manifold, allowing oil to squirt out. <img src="graemlins/c.gif" border="0" alt="[ouch]" />

Cheers,

Cooper

RJP 951

There is also a plastic bushing that is part of the equation. Does the bushing go on the tube before (above) the o-ring?

Ron

Steve Lavigne

[quote]Originally posted by rjp951:
<strong>There is also a plastic bushing that is part of the equation. Does the bushing go on the tube before (above) the o-ring?</strong><hr></blockquote>

I bought that bushing, but it doesn't fit. I think it might go in place of the steel boss that was already on my dipstick tube. Perhaps some dipstick tubes don't have a steel boss.

RJP 951

[quote]Originally posted by Steve Lavigne:
<strong>

I bought that bushing, but it doesn't fit. I think it might go in place of the steel boss that was already on my dipstick tube. Perhaps some dipstick tubes don't have a steel boss.</strong><hr></blockquote>


Interesting...

Mine has the boss (i.e., raised rim) about an inch up from the bottom of the tube, but also had the plastic bushing installed. I ordered a replacement from Ian's, and the package included both a bushing and an o-ring. I didn't see an o-ring when I removed the tube, but if it was there it could easily have fallen off if it had been installed below the bushing.

[EDIT]

I found this, which indicates there are two pieces... the bushing and o-ring, or "seal" and "spacer" as designated here. The picture doesn't show which goes on first, though....



Anyone have a clue?

Ron

Matt

In the NA blocks, and I believe the turbo blocks, there is a groove in the block itself, a quarter inch or so down the bore, for the o-ring. With the dipstick tube removed, look carefully down the hole, you'll probably see the groove. And it does sound like you may have had the tube misaligned, with the tube-to-manifold bracket not in the right place.

Matt

Alan C.

Has anyone ever had the dipstick pushed up while driving? I had this happen once. Shot oil on the underside of the hood. Never could figure out why. No leakdown or compression problems.
Alan

Steve Lavigne

[quote]Originally posted by rjp951:
<strong>Anyone have a clue?</strong><hr></blockquote>

I ordered both the spacer and the seal, but I couldn't figure out a way for the spacer to be installed that made any sense to me. I ended up leaving it out. It wasn't installed when I originally removed the dipstick.