benz_addict

Yup, worse fear confirmed. Can anyone direct me to a used or new cylinder head? For drivers side only. I'd rather purchase a new one than spend money refinishing this head.

TIA

KLR CLS

Same head on the bank with the cooked piston? Was it torqued in correct sequence?

Jakpro1

I am so sorry bro! Will keep an eye out for ya

kjlindgr

How much off is it? Can it be resurfaced? Resurfacing a head is only $200 here in my neck of the woods. I'm guessing that's a far cry from the price of a new AMG head.

AMG_RL

beat me to it. If it's not severely warped I would take it to a machine shop and have them resurface the head. much more cost effective approach than locating a new head.

GT-ER

x2

So I'm guessing that was the noise it was making? Can't see why a warped head would make that noise.

benz_addict

I'm getting good 150-160PSI in all cylinders except number 8 which has 0 compression meaning bent valve and other head related damage. I'm getting ALOT OF blow by pressure probably open intake valve. I'm pulling it out but shopping for a cheaper alternative. If not I'll purchase another head from a member that's here that already offered

Cyl 6 piston that was replaced in the winter.

GT-ER

Open valve will not give you excessive blow by ( can't see how it could )...broken piston or rings would though. I suggest you disassemble first before buying anything. I just don't see it being a warped head. The symptoms don't add up.

shardul

iTrader: (1)

i have pistons also

AgSilver

Blow-by through the manifolds = valves
Blow-by through the crankcase= piston

#8 inevitably runs lean unless you have modified the rail.

benz_addict

It makes sense because that noise that was coming sounded like is coming from cyl 8 area. That's where it was the loudest even with when I heard it with the screw driver to my ear. Cyl 8 has zero compression!!

Thanks for the input guys shardul I will let you know asap which one will be more wise investing in this head or a used one. I have the part numbers for the parts I need but need to verify pricing for:

valve intake:
1130530601 $8.25
x 8
= 72

Valve exhaust:
1130500227 $39.50
x 4
= 160

Valve seat intake:
1130530431 $6.50
x 8
= 56

Valve seat exhaust:
1130530432 $9.75
x 4
= 40


Valve seal:
6120500058 $14.00


Valve spring outter:
1550530120 $19.50
x 12
= 240

valve spring inner:
1550530020 $19.50
x 12
= 240

total: around $1000 in parts give or take
recondition of head: $300~400

total: $1400

Peter or anyone know a good shop around the GTA area please let me know. Just trying to get some quotes.

outrun

how in the fiznuck did do you that?

benz_addict

I don't know but could be when I was doing alot of WOT runs then I noticed a sudden jerk and car started misfiring and making noise since then. I just noticed cyl 8 spark plugs electrode tips were bent. I was told they "melted into that shape" then replaced the plugs and since then it was still misfiring. Cyl 8 has valve float I think with 0 compression. Pics to follow.

stevebez

No. 8 at it again......

Getting a little worried now....

Nino S

what can I do to try and avoid this happening besides not doing WOT runs? I just got my car a month ago and keep seeing threads with #8 going bad and want to do everything I can to minimize the chance of this happening. Good luck with the repair OP

shardul

iTrader: (1)

since your car is stock you dont have to worry about this too much. depending on your mileage i would change the fuel filter assembly.
once you start modding i would recommend a TTM fuel rail and injectors.

GT-ER

Can I assume that *most* people who blew number 8 ( assuming the tune is good ) were doing high speed runs? I'm guessing that perhaps the high injector duty cycle coupled with perhaps a not-so-good flowing rail keeps it lean after an extended run?

shardul

iTrader: (1)

also it has to have been a super cold day for timing not being pulled.

Axxel

Im no expert, but, i had a car (Not AMG) who made that exact noice, with a melted/bent plug and almost zero compresion. That one had a cracked piston ring lands and a scored cylinder due to detonation.

I would def lift the head before i order or do anything.

GT-ER

Exactly what I was thinking.

benz_addict

Yup, my cyl 8 piston is destroyed. Posted pics in another thread.