Lost Compression today !

[andrewwynn]

Cn I think was suggesting to use BM to spot clean parts of an only partly disassembled engine. Then to remove any residue with the method described


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[upallnight]

Originally Posted by cn90

- Change all valve seals, use BMW OEM seals only.
- You can buy these seals and give them to the machine shop.
- Valve brand: in the Volvo forum there is a debate of OEM Valve ($80/each for the Volvo, idk BMW cost) vs Osvat vs TRW etc.
- Some people think the cause of burned valve is from leaky valve seals ---> oil caking on the stem ---> valves cannot close properly.

- Does anyone know the price for the BMW valve?

- From now on, use only Octane 91 gas, which should reduce the risk of burned valves.
- Clean the injectors too.

[dadysev]

Well she's all back together after 4 days of hard work!
Cleaned Valves
Cleaned the head
Lapped Valves
Cleaned the block
Cleaned lifters
Started one time!!
Only issue is i didn't want to wait for a vans kit from amazon and i wasn't having vanos errors before but now i am. It could be the fact the the pressure needs to build up still I'm still going to rebuild it in a few weeks. I'm just happy its running again.

[Scott ZHP]

Originally Posted by Crowz

There is a stronger version of the gm injector/head cleaner than what that guy was using in that video I linked. Unfortunately I don't have the part # for it. The stuff is very powerful and will flat out take the carbon off.

I will see if I can find the part # but I doubt you would have time to get it and use it in the time frame your going for.

Late to the party, but for future reference... Audi direct injection engines are notorious for carbon buildup. I yank the intake on my A4 and de-carbon the ports/valves with BG "ISC" or Induction System Cleaner. It's unbelievably nasty and softens/dissolves the carbon.

https://www.bgprod.com/catalog/gasol...ystem-cleaner/

[dadysev]

Originally Posted by Scott ZHP

Late to the party, but for future reference... Audi direct injection engines are notorious for carbon buildup. I yank the intake on my A4 and de-carbon the ports/valves with BG "ISC" or Induction System Cleaner. It's unbelievably nasty and softens/dissolves the carbon.

https://www.bgprod.com/catalog/gasol...ystem-cleaner/

I have to remember this for my 2011 550 with the direct injection motor but the intakes are impossible to get to as they are on the outboard side of the V.

[cn90]

- What BRAND of valves did you use?

- Also, how many did you replace? Did you replace all 12 Exhaust valves preventively or only 1 burned valve? This is the debate in Volvo forum...

[80stech]

Very interesting post for sure! What brand of head gasket? No problems with head bolt threads in block?

[Scott ZHP]

Originally Posted by dadysev

I have to remember this for my 2011 550 with the direct injection motor but the intakes are impossible to get to as they are on the outboard side of the V.

The outboard side?

I have the BG tool, similar to a pressurized injector cleaner, with a fogging nozzle that you can mount in the throttle body. It connects to shop air; you run the engine at about 2000rpm and it "fogs" the intake and the backsides of the valves with the cleaner. There are youtube videos somewhere. Probably not as effective as a walnut shell blasting, but it works.

The intake on VAG 2.0 TFSI comes off in about an hour. I fill three of the four intake ports with ISC and let it sit for a couple of hours, then chuck a brass brush into my drill to really clean the stems/guides/ports. Turn the engine over to close the 4th and repeat. It's really nasty stuff, but the Audi guys swear by it.

[dadysev]

Originally Posted by cn90

- What BRAND of valves did you use?

- Also, how many did you replace? Did you replace all 12 Exhaust valves preventively or only 1 burned valve? This is the debate in Volvo forum...

can't remember. only did 2 on Cylinder 3 even though it was only one that was done. After cleaning all the valves they looked brand new so no need to change all. The supplier i get them from only had 2 in stock also.

[dadysev]

Originally Posted by 80stech

Very interesting post for sure! What brand of head gasket? No problems with head bolt threads in block?

My supplier i deal with got me the Elring head gasket.
No problems with bolt threads as the head was not over heated to put stress on the bolts. Everything went back in perfectly!