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more on compression woes - passat 96 vr6

 
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starburst

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Since: Aug 19, 2005
Posts: 37



(Msg. 1) Posted: Sun Feb 11, 2007 7:42 pm
Post subject: more on compression woes - passat 96 vr6

starburst wrote:

> Well now, got the compression numbers on the vr6 passat that gave up
the ghost a couple of weeks ago. Cyls 2,4 and 6 are all around 180 psi
(cold engine). Cyls 1,3 and 5, O psi, 60 psi, and 0 psi.
>
> Bent valves on 3 and 5? Skipped tooth on timing chain? blown timing
chain tensioner? All of the above? Any bets before I take off the valve
cover?
>

And JRE responded

>Sounds like a cam stopped. Ugly if it's an interference engine. A
>couple other possible causes: Sheared woodruff key or broken (or
>backed-out) dowel on cam sprocket, broken camshaft (esp. if engine ran
>low on oil).


And JRE takes the prize on this one. Finally got around to pulling the
valve cover and sprocket cover. Rear sprocket had come completely undone
and the dowel had backed out to the sprocket cover, and the woodruff key
had sheared. The thing was wobbling all over the place. I'm amazed that
I got any compression at all on cyl 3.

The thing I'm wondering is how this happened in the first place. Since
I've had the monster (2 years) it's been really well-cared for. Plenty
of oil and coolant...etc. One weird thing - I found broken pieces of a
timing chain tensioner inside the upper sprocket cover, but the
tenisoners themselves appear fine. I wonder if maybe somebody replaced
the tensioners at some point and rebuilt the head, but didn't torque the
sprocket properly...? Freaky.

Anyway, next weekend I get to see how bad the valves look.

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dave AKA vwdoc1

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Since: Nov 26, 2006
Posts: 726



(Msg. 2) Posted: Sun Feb 11, 2007 9:56 pm
Post subject: Re: more on compression woes - passat 96 vr6 [Login to view extended thread Info.]

Glad you are finding out what is wrong.
Sorry you actually have damage, but you suspected you would find it.
How many miles on the engine? Would it be wise to replace entire engine or
you have time to repair it?

Remember to Take Pictures!!!
BTW are you on the vwpassat group on yahoo?

later,
dave
(One out of many daves)

"starburst" wrote in message

> starburst wrote:
>
> > Well now, got the compression numbers on the vr6 passat that gave up
> the ghost a couple of weeks ago. Cyls 2,4 and 6 are all around 180 psi
> (cold engine). Cyls 1,3 and 5, O psi, 60 psi, and 0 psi.
> >
> > Bent valves on 3 and 5? Skipped tooth on timing chain? blown timing
> chain tensioner? All of the above? Any bets before I take off the valve
> cover?
> >
>
> And JRE responded
>
> >Sounds like a cam stopped. Ugly if it's an interference engine. A
> >couple other possible causes: Sheared woodruff key or broken (or
> >backed-out) dowel on cam sprocket, broken camshaft (esp. if engine ran
> >low on oil).
>
>
> And JRE takes the prize on this one. Finally got around to pulling the
> valve cover and sprocket cover. Rear sprocket had come completely undone
> and the dowel had backed out to the sprocket cover, and the woodruff key
> had sheared. The thing was wobbling all over the place. I'm amazed that I
> got any compression at all on cyl 3.
>
> The thing I'm wondering is how this happened in the first place. Since
> I've had the monster (2 years) it's been really well-cared for. Plenty of
> oil and coolant...etc. One weird thing - I found broken pieces of a timing
> chain tensioner inside the upper sprocket cover, but the tenisoners
> themselves appear fine. I wonder if maybe somebody replaced the tensioners
> at some point and rebuilt the head, but didn't torque the sprocket
> properly...? Freaky.
>
> Anyway, next weekend I get to see how bad the valves look.

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starburst

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Since: Aug 19, 2005
Posts: 37



(Msg. 3) Posted: Mon Feb 12, 2007 7:42 am
Post subject: Re: more on compression woes - passat 96 vr6 [Login to view extended thread Info.]

dave AKA vwdoc1 wrote:
> Glad you are finding out what is wrong.
> Sorry you actually have damage, but you suspected you would find it.
> How many miles on the engine? Would it be wise to replace entire engine or
> you have time to repair it?
>

I can't afford to replace the whole engine, and it's only got about 95k
miles. This is pretty pathetic performance if you ask me. The head's a
goner, for sure, and I've got a line on a replacement at a junkyard. I
don't have the time to rebuild the head that's in it. My big concern is
that the pistons got fried. We'll see.

We're down to one car (the 89 jetta, aka Miss Reliable), but what's a
body to do? I can't afford to have somebody fix the passat - it could
likely cost more than the value of the car, and I'm pretty pissed off at
it. It's like being married to somebody you don't like, but not bein'
able to afford to get divorced.

> Remember to Take Pictures!!!
> BTW are you on the vwpassat group on yahoo?

I've been there a few times (last year), but most of the discussions
seemed to revolve around cosmetic stuff - color combos and boom boxes
and such. Vortex's tech/vr6 group is pretty good, though. - C
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dave AKA vwdoc1

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Since: Nov 26, 2006
Posts: 726



(Msg. 4) Posted: Tue Feb 13, 2007 1:55 am
Post subject: Re: more on compression woes - passat 96 vr6 [Login to view extended thread Info.]

Thanks I will have to check out that Vortex's tech/vr6 group! Wink

The conversations we have had on the vwpassat group on yahoo was about a
noises/problems with some of the engines.
I heard noises on a '01 Golf GTI with the VR6 engine, but the owner only
complained of the Engine check light coming on before the emissions test.
The original owner only had 56K miles on it and the noise was emanating from
the camshaft area. It was caught "early" but still would have been a $3300
bill at the dealer. Owner was able to prove that regular oil changes were
done and the warranty repair was just approved. Currently it is still at
the dealership as parts supposedly need to be ordered for the engine.

In your case did you hear any noises before this problem occurred? I will
assume that you are not the original owner that possibly had the 100K miles
or 10 year warranty on the powertrain.
Maybe the original owner did not maintain the oil change intervals.
OR maybe the oil formulations have changed and that caused problems in
engines like in both of these VR6 engines.

later,
dave
(One out of many daves)



"starburst" wrote in message

> dave AKA vwdoc1 wrote:
>> Glad you are finding out what is wrong.
>> Sorry you actually have damage, but you suspected you would find it.
>> How many miles on the engine? Would it be wise to replace entire engine
>> or you have time to repair it?
>>
>
> I can't afford to replace the whole engine, and it's only got about 95k
> miles. This is pretty pathetic performance if you ask me. The head's a
> goner, for sure, and I've got a line on a replacement at a junkyard. I
> don't have the time to rebuild the head that's in it. My big concern is
> that the pistons got fried. We'll see.
>
> We're down to one car (the 89 jetta, aka Miss Reliable), but what's a body
> to do? I can't afford to have somebody fix the passat - it could likely
> cost more than the value of the car, and I'm pretty pissed off at it. It's
> like being married to somebody you don't like, but not bein' able to
> afford to get divorced.
>
>> Remember to Take Pictures!!!
>> BTW are you on the vwpassat group on yahoo?
>
> I've been there a few times (last year), but most of the discussions
> seemed to revolve around cosmetic stuff - color combos and boom boxes and
> such. Vortex's tech/vr6 group is pretty good, though. - C
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starburst

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Since: Aug 19, 2005
Posts: 37



(Msg. 5) Posted: Thu Feb 15, 2007 10:23 pm
Post subject: Re: more on compression woes - passat 96 vr6 [Login to view extended thread Info.]

Lost In Space/Woodchuck wrote:
> As I posted on vortex.
>
> From looking at your pictures the engine looks like it has a lot of crud
> inside it. Does the camshaft turn that the gear is removed from? You may
> have seized it if oil pressure when low. Pull the oil pan and take a look.
> BTW, you will have bent valves and you "must" figure out why the key sheared
> off!
>

Thanks on both spots. Thing is there was plenty of oil in the car at the
time that the car died. She'd been losing about a quart every 800 miles
or so, mostly through the rear main seal, but I was always on top of it
and had just changed the oil a week earlier. The crankcase is still
full. I just went out and tried to turn the cam and it isn't budging.
Why would the cam seize if there was enough oil? And the engine had just
gotten up to operating temperature when it blew. In your experience (and
I know you've got lots) when the chain tensioners break at speed, what
other damage do you see? Bent valves for sure, but would the seized cam
be normal?

I'll take the head off next and have a look. Thanks - Chris
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pfjw

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Since: Nov 26, 2006
Posts: 187



(Msg. 6) Posted: Fri Feb 16, 2007 7:24 am
Post subject: Re: more on compression woes - passat 96 vr6 [Login to view extended thread Info.]

On Feb 15, 10:23 pm, starburst wrote:

> Thanks on both spots. Thing is there was plenty of oil in the car at the
> time that the car died. She'd been losing about a quart every 800 miles
> or so, mostly through the rear main seal, but I was always on top of it
> and had just changed the oil a week earlier.

It has been my (unfortunate) experience that if an engine is eating
oil at the rate you describe, it is not long for this world even if
you determine and identify the largest single source for the leak. It
is that "mostly" that does it for me. I have nursed a Mercedes TD
engine through about 10,000 miles under those conditions, but
ultimately the engine seized. As i knew it was coming and as the
engine had over 300,000 miles on it, I was both prepared and not upset
with it.

Dave has it right. At least a new or rebuilt head, and make sure that
the cylinders have not been bunged. Furthermore, you need to check the
bottom end as well, the main bearings may be compromised if the oil
was somehow contaminated (shavings, ground metal, sucked-in coolant or
whatever) and that contributed to the failure.

With respect, this may be the time to scout the junkyards for a rear/
side collision VR6 engine and contemplate a heart-transplant if you
cannot afford to do it from a rebuilding house.

Peter Wieck
Wyncote, PA
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Lost In Space/Woodchuck

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Since: Dec 07, 2005
Posts: 278



(Msg. 7) Posted: Fri Feb 16, 2007 7:40 pm
Post subject: Re: more on compression woes - passat 96 vr6 [Login to view extended thread Info.]

just because the oil is full doesn't mean it's getting to the parts that
need it. The next step into remove the oil pan and see if the pump pick-up
is plugged and to what degree. Post a picture so I may take a look.


"starburst" wrote in message

> Lost In Space/Woodchuck wrote:
>> As I posted on vortex.
>>
>> From looking at your pictures the engine looks like it has a lot of crud
>> inside it. Does the camshaft turn that the gear is removed from? You may
>> have seized it if oil pressure when low. Pull the oil pan and take a
>> look. BTW, you will have bent valves and you "must" figure out why the
>> key sheared off!
>>
>
> Thanks on both spots. Thing is there was plenty of oil in the car at the
> time that the car died. She'd been losing about a quart every 800 miles or
> so, mostly through the rear main seal, but I was always on top of it and
> had just changed the oil a week earlier. The crankcase is still full. I
> just went out and tried to turn the cam and it isn't budging. Why would
> the cam seize if there was enough oil? And the engine had just gotten up
> to operating temperature when it blew. In your experience (and I know
> you've got lots) when the chain tensioners break at speed, what other
> damage do you see? Bent valves for sure, but would the seized cam be
> normal?
>
> I'll take the head off next and have a look. Thanks - Chris
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