[Vwdiesel] Bart's blowby

[James Hansen]

the lifters should grenade long before the cam bearing cap goes south.

When pistons hit the valves, the valves are designed to pop out of the way,
into the head. The valve *SHOULD* be hooched at the very least before any
damage of this nature shows up, but good idea Sandy.

Bart, you cleaned the head bolt holes perfectly clean and dry, right? Light
oil lube on the bolt threads? hope no head cracks from gallery to
daylight...

Any valve clatter discernable over the general mayhem? Like a collapsed
lifter or partially collapsed lifter bucket? I'm thinking you could lose a
lot of oil pressure that way on a hyd head.  With all the smoke, hot
unburned oil being white, I would venture a pooched exhaust bucket
actually.. or two.

Um, you reinstalled the oil pressure bypass with the correct spring?

Bart, you said it was "supposed to be gone through"  I bought a combine two
years ago that had "gone through the shop"...  Once I used it I determined
it must have been left running, in gear, and pointed at the shop when it
made two new doorways in the dealership's shop cause that's how well it was
"gone through".  Sorry, I know you don't want to hear that sort of thing...
Combine went back.

Yours wouldn't be the first rattle can rebuild that ever happened.

Broke some rings.  Hmm, well, the valve doesn't really hit on the ring land
first, and that's the first thing that would break, the land or the piston
area that is above the groove along the periphery. If damaged, it usually
just gets pushed downward, and traps the ring from moving, which effectively
keeps it from sealing. The type of load on a ring in that direction doesn't
break them unless the piston comes apart and there are shear loads involved.

If this was a turbo block, I would be looking for oil squirter nozzle
damaage, but it isn't, so I wouldn't recomend that...  sorry, just sort of
thinking "out loud" as loud as typing gets that is...

I would get the pan off, it isn't too terrible a job in frame, and you can
remove the pump and pickup tube, and check it if nothing else if the head is
indeed fine.

If the oil is coming from the head itself or head gasket, or *shudder*
block... you know what that entails... off goes the head again, new bolts,
new gasket.... blech.  I'm not unfamiliar with having to rip apart stuff
after it is assembled "finished" and doesn't work right.

Like was mentioned, I think you have more than one thing going on at once
here, at least a partially collapsed exhaust lifter bucket.

gimme an address, I send you some heat shields, not that the post office is
the fastest, but they get there.  You need to spin the engine over with the
starter with the fuel shut off, and your head under the hood making some
observations as to the nature of the clitter clatter going on, and look for
leaks and stuff.
-James




-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
Behalf Of Sandy Cameron
Sent: Monday, October 18, 2004 9:13 PM
To: Bart Wineland; vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] Bart's blowby


At 10:18 PM 18/10/04 -0400, you wrote:  Nobody but me seems
>to think I could have broke some rings or bent valves when I spun my cam
>gear with the starter?

Low oil pressure, spun cam sprocket,

What's the likelyhood of a damaged/stretched cam bearing cap due to
valve/piston collision?

I'm not clear on the cam bearing oil gallery, how it's distributed.
Any takers?

Sandy

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