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What kind of sealant for the cam cover?

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Re: What kind of sealant for the cam cover?

Post by BlackBart » Mon Jul 09, 2018 4:23 pm

Ahh, the cam wheel screws are an idea - it's a clunk at the cam wheel end. The reverse - if you leave the cams down on the head, the cover hits the top rear rim of the wheel before it's off the dowels.

Could you get a little combo wrench in behind the wheel?

#'s 1 & 2 make perfect sense.

I have a new OEM PCV kit from ipd here as well, so I'll do it all at the same time. That may have helped cause the original cam seal leak. Good records of maintenance on most things on this car, but no trace of PCV replacement.

O-rings and VVT gaskets on the way.
Last edited by BlackBart on Mon Jul 09, 2018 4:40 pm, edited 1 time in total.


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Re: What kind of sealant for the cam cover?

Post by BlackBart » Mon Jul 09, 2018 4:37 pm

This is the only thing my NAPA had. But it is anaerobico.

IMG_1893.JPG



It's loose, just won't come straight up....
IMG_1917.JPG


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Re: What kind of sealant for the cam cover?

Post by BlackBart » Fri Jul 13, 2018 11:03 am

prwood wrote:
Mon Jul 09, 2018 4:14 pm
If you don't remove the timing gears before removing the cam cover, some of the screws holding the timing gears on to the cams can get caught up on the cam cover or the cylinder head prevent them from fully lifting away. I took a careful look at them and loosened up just the ones that were preventing full movement.
^^Yes. I removed just the lower cam wheel bolt on each, did a lot of careful jiggling around, and it came straight up. Also, your front cam seal lip can get caught on an edge under there and won't let it lift up.

So it's off. Took some photos of what I found. Interesting that there is increasing varnish / sludge(?) as you head away from the front of the engine and the oil source. I've read accounts of this on engines - the farther from the fresh oil and higher pressure, the more the build up. I think, based on the sludge issues thread, this engine is due for some detergent oils and frequent changes. Previous owner did mostly good maintenance, but maybe extended their oil change intervals or missed a couple??

I assume this is factory? They obviously used a continuous bead of sealant rather than the roll-on anaerobic goop we're using now.
xIMG_1948.JPG

Most cam lobes are clean
xIMG_1952.JPG

The non-contact side of some towards the back are varnished
xIMG_1953.JPG

Progressively darker buildup as you head south down the engine
xIMG_1955.JPG


Pretty gunky down here, but I don't see clogged oil ways
xIMG_1958.JPG


Varnish at bearing journals??
xIMG_1960.JPG

Front to back, more buildup at bearing journals
xIMG_1963.JPG


Normal wear or lack of oil?
xIMG_1969.JPG
xIMG_1973.JPG


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Re: What kind of sealant for the cam cover?

Post by SuperHerman » Fri Jul 13, 2018 11:58 am

I see the use of anaerobic sealant. When you scrape it off it will come off in flakes. This is what the red stuff being recommended is. Once it is sandwiched to the top and cured, other than the color, it will look the same upon removal.

The sludge build up is consistent with what I saw on my 2001 XC70 when I pulled the head. It may be the turbo heat causing the extra baking.

Are you planning on dropping the oil pan? When I did mine that is what I did. You will find a similar build up below. I cleaned the passages as well as I could and flushed out any junk with gas and brought the stew to recycling.

If you are doing all the clean up yourself, make sure you oil your cams after you wash them or they will rust.

I assume you are going to at least lap the valves, replace the valve stem seals and install new rubber o rings. Now is the time and it is not that bad a job, especially if you can work the head inside with talk radio or a ball game on in the back ground. I took my head and upper cam cover to a shop that did ultrasonic cleaning and had them cleaned and the head trued up before doing the lapping and seals.

The head is aluminum and the cams are iron - so the head journals will show more wear. I wouldn't be worried, plus there is really nothing you can do.



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Re: What kind of sealant for the cam cover?

Post by oragex » Fri Jul 13, 2018 12:30 pm

Some varnish is normal, doesn't look that bad to me.. I'd make sure the small oil passages in the cam hubs are clear as well.


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Re: What kind of sealant for the cam cover?

Post by BlackBart » Fri Jul 13, 2018 12:31 pm

No plans to do anything with the pan, nor to pull the head. This is all the result on my mistake shearing off the cam holding fixture bolt inside the rear of the exhaust cam while changing the seals. It only has 125k miles, and good records, although there are gaps in the oil change receipts.....

I'll start to use cleaning oils and more frequent changes, see what effect that has.

I put a new used engine in my Audi A4 which was apparently sludged up by the previous owner. The oil flow wasn't enough, a rod bearing spun, and it threw a rod through the block out in the sticks of Wyoming, all before I could shut it off. As long as I was in there, I rebuilt the turbo, replaced the oil pump, oil pump chain, every piece of oil plumbing, increased cooling, increased oil capacity with big filters.....but I still don't trust that engine.


When cleaning the top of the actual head, what have others done to make sure nothing is dropping down into the head and block?


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Re: What kind of sealant for the cam cover?

Post by SuperHerman » Fri Jul 13, 2018 2:48 pm

Got it - no head removal.

For cleaning up I would open the oil drain plug and position a catch pan. Jack up car so that the drain plug is at the lowest point - If I recall entire front should be slightly higher and passenger side slightly lower as the drain pan plug is in the rear passenger corner. Where ever the drain plug is located you don't want pooling of the gunk and gas. Maybe even height tilting back is the route. Do your cleaning being as careful as you can - then rinse/flush with gas - it will drain through the oil pan into your pan. If you dislodged any big lumps they should be flushed out. I have done this on several vehicles after I ran out of carb cleaner on one - gas is way cheaper and if sent to be recycled not an issue. Plus any residue will not harm anything. Be smart and you will be fine.



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Re: What kind of sealant for the cam cover?

Post by abscate » Fri Jul 13, 2018 2:59 pm

Mild varnish and buildup, nothing to worry about.It is an engine, not a neuron.

Your cam bearings are fine - these are lightly loaded, unlike crank and rod.


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Re: What kind of sealant for the cam cover?

Post by BlackBart » Fri Jul 13, 2018 3:36 pm

Good. Thanks.


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Re: What kind of sealant for the cam cover?

Post by SuperHerman » Fri Jul 13, 2018 4:23 pm

Clean it up as best you can. Mine was slightly worse than yours - in your third picture you can see sludge starting to build up on the cam lobes. If not cleaned it will grow and ultimately could cause misfire issues as it could affect the tappets. Sludge attracts sludge and that is why you have build up areas. The few instances I have read about on the Volvo engines and valve issues is on #5 - which your pictures show why.



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