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there are probably some german websites that you could get it from, maybe even american like summitracing.com, but you would need to call to find out im guessing. my bigger concern would be whether the block and head are in spec.
if i remember correctly, MB sells replacement pistons that require you to bore out the engine ever so slightly. if this car isnt a collector then you are better off swapping in a new engine i think. the cost of the tear down and rebuild will definitely be larger than just finding a replacement.
just find a nice m104 and slap a turbo on it check out turbobandit.com
use your original engine as a table or put it on display in your garage.
That’s what I want are the repair size pistons that are .5mm larger. I’m a Mercedes Tech so I’m doing all the work except the machining myself. Much much cheaper than doing a turbo 104 build lol The cylinders have scoring but all in I’m looking at around 2000 where as a turbo 104 would be easily around 10000 done properly and not half assed. I bought some head bolts from turbo bandit to help with make the head gasket last longer.
I can’t look for a C36 on that site for some reason, how did you find it? Well the pistons from Benz are not available and $1100 A PIECE on EPC... that’s insane! Buying them from Mahle is $150-160 with the rings and wrist pins per piston. It’s still not cheap but a lot better lol
hey why arent you going with repair size 1 instead? do you think the engine is that worn? i'd guess with repair size 1 that you might get away with skipping the machining on all or most cylinders. the resurfacing process for these engines sometimes only requires a bit of solvent and a special brush that is used to attract the silicone molecules to the surface, i've seen them do this process with a machine but it can also be done by hand.
Exactly, the ones in the pictures are for a standard 104 not the forged pistons but the HWA number is correct. Cylinder 2 has some bad scoring. I don't know how it happened but I have only owned the car the last 30k and who knows how it was taken car of before. Boring it is the same as doing .30 over for a US engine. I want to do it right rather than hone and hope the rings seal well. Taking .50mm off from honing is a lot of honing lol I'm going to get the repair pistons from Mahle since they are much cheaper than Mercedes and actually available. This may turn into an engine rebuild thread. Head is at the machine shop right now with all the valves leaking to get a quote on what it will take to repair.
Well Mahle does not offer pistons to correctly fit the M104 AMG engine. They make them to fit the standard 104 though. The machine shop is confident that honing the cylinders and putting in new rings will be good. Now the struggle of finding rings that don’t exist lol The head had leaky valves so the engine is getting a complete valve job, honed, cleaned, decked, new rings, and new bearings.
So here’s some info that’s nowhere on the internet. Rings are not available from Mercedes. Ring sizing is 1.2mm top ring, 1.5mm second ring, and 2.5mm oil ring. The oil ring is an odd size. Of course the bore is still 91mm. Just thought I’d add this since I cannot be the only one to ever rebuild this motor since the cars are getting older
Got some piston rings from Total Seal coming. They were able to get me the right size for all rings. I’m just glad the light scoring isn’t deeper so I can get away with honing. Also doing new bearings, all new seals, new timing chain and guides, and new oil pump to name some of the things. Turbo bandit head bolts to maybe help the head gasket last longer (can’t remember if I said that or not, mobile wont let me see when posting). I thought it ran strong before but now I can only imagine. Without the lazy 4 speed it should be a lot of fun
Wow that's some serious mechanics. Great work. Hope everything goes well after this.
For the video, drop the thing onto YouTube and copy/paste the link to this board. Simples
So here’s some info that’s nowhere on the internet. Rings are not available from Mercedes. Ring sizing is 1.2mm top ring, 1.5mm second ring, and 2.5mm oil ring. The oil ring is an odd size. Of course the bore is still 91mm. Just thought I’d add this since I cannot be the only one to ever rebuild this motor since the cars are getting older
Can I have the total seal part numbers for the rings im soon to do my c36 engine also
They had to be made from what I was told. You just need your bore and the thickness then gap them when you get them. Factory gap spec is .012-.025 for both compression rings
After the engine was rebuilt i was getting a random misfire at high rpm. Would not consistently do it and had to be under some sort of a load. Did some looking with the SDS at the DM “diagnostic module” which is literally only there to meet CARB. Those values showed the car doing 300kph at 8100rpm and the IAT was -40 celcius and the car voltage just showed constant. The module new is around 2k and specific to the AMG and shows no availability. So I took it out and it fixed every issue I had with a misfire and the cat efficiency issue I had prior. Only thing is it doesn’t have a check engine light but I don’t mind
10-07-2017, 07:09 PM
