The Resurrection of (10/1998 to 01/2021, 11/21- 11/25) Elizabeth 1999 V70T5M56 Cylinder Head Job Topic is solved

[misha]

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I miss my tinted windows on my 850...in fact...on both cars.
New government regulations from 4 years ago...long story.

[erikv11]

Additional 2 were about to burn?

I'll be in a head rebuilt job soon because of bad valve stem seals(still original).
Will need to check compression first to be sure the engine is in good shape or is that not necessary?

All info you can provide is welcome.

I'd say that is not necessary but a smart idea, I'd check compression just for peace of mind even though the bottom half is almost always in great shape.

Our new (07) XC70 has tinted windows, looking forward to seeing how I like them in the summer months. Looking forward to the summer months period.

[foggydogg]

Thanks foggydogg and hoping you are doing well. The garage is what I always promised myself when I retired and especially now the old joints aren't too happy in the cold!

Actually today was cold but with a clear blue sky so wan't too bad.

I'm hoping over on the eastern shores it is much more balmy and allows play to continue on your cars. Abscate is now a man on a mission. Elizabeth will hopefully soon be back in the land of the living!

Neil.

Looks like it's been Right Airish up in Alberta ( Eastern Shore waterman speak for 'snotty weather' ), but Albany has been taking it on the chin.
Steve is winning the New Cold War at the moment, along with an extra star for determination.
Southern Delaware just had three little storms with 4 snow events - yes, we got a twofer.
Newly arrived S60 T5M donor car showed up between snowfalls. I'm not as cold-hardened as you up North.

[bmdubya1198]

It was a beautiful sunny day today in the mid 50s here... I feel I shouldn’t even be posting that, you guys up north don’t even want to hear about it .

That said, I still spent the day complaining that it’s too cold. I’m ready for spring already! With how much I hate anything under 60, you’d believe I’m actually from NC and not NJ.
I picked at my E39’s cooling system though, I might finish the couple hours worth of work by the end of the week if I keep going at this pace!

Not looking forward to the rest of the week... the rain returns Wednesday. Seems we can’t escape it this time of year.

[misha]

Additional 2 were about to burn?

I'll be in a head rebuilt job soon because of bad valve stem seals(still original).
Will need to check compression first to be sure the engine is in good shape or is that not necessary?

All info you can provide is welcome.

I'd say that is not necessary but a smart idea, I'd check compression just for peace of mind even though the bottom half is almost always in great shape.

Our new (07) XC70 has tinted windows, looking forward to seeing how I like them in the summer months. Looking forward to the summer months period.

Just to make clear on this....
Can bad valve stem seals or seats...or something in the head affect compression numbers or not?

Also compression test... on cold or hot engine...or both?

Do i need a whole package...dry,wet...leak down?

[abscate]

Additional 2 were about to burn?

I'll be in a head rebuilt job soon because of bad valve stem seals(still original).
Will need to check compression first to be sure the engine is in good shape or is that not necessary?

All info you can provide is welcome.

Per machine shop, Hunts in Schenectady NY, two more were Too damaged to seat. I’ll try to get them back and show pictures

The third one , of course, had a pie piece missing. That’s not going to buff out...

[scot850]

There is a lot of carbon build up in that head. I am wondering if the issues we are having with valves burning is due to stem seals leaking into the cylinders and burning causing hot spots taking the valves out?

As to misha's questions. Warm engine for cylinder compression tests. Based on results, if you have a low reading, then a wet test with a teaspoon of oil in the bore and re-test. If the readings improve especially in a low reading cylinder from a dry test it shows the piston rings are an issue in that cylinder. If the wet test shows no change in a low reading cylinder then a valve is bad. Usually an exhaust valve.

Neil.

[scot850]

Here is another question. Are the engines with hydraulic valve lifters worse for valve failure than solid lifters? Could it be failing hydraulic lifters or low oil pressure not allowing the exhaust valves to not open sufficiently allowing them to overheat?

Neil.

[abscate]

There is a lot of carbon build up in that head. I am wondering if the issues we are having with valves burning is due to stem seals leaking into the cylinders and burning causing hot spots taking the valves out?

I think this exactly what happened to me. I didn’t burn a lot with Castrol High Mileage Synthetic but the Pennzoil synthetic burned nasty.

I started smoking on overrun at about 180k miles, 80k ago.

I got lucky in the valve drop, 5 miles from home on a 500 mile round trip, didn’t even need a tow.

[misha]

As to misha's questions. Warm engine for cylinder compression tests. Based on results, if you have a low reading, then a wet test with a teaspoon of oil in the bore and re-test. If the readings improve especially in a low reading cylinder from a dry test it shows the piston rings are an issue in that cylinder. If the wet test shows no change in a low reading cylinder then a valve is bad. Usually an exhaust valve.

Neil.

No problem with valves....car pulls strong...no hicups,smooth running,just puffs of blue smoke after idling a bit and oil consumption which is getting worse...1l/1000km and there are no leaks.Engine is bone dry.
Typical for bad valve stem seals and car have 340k km on the clock....so they are overdue anyway.