Another M271 Cam Chain Issue

[Mike_wilts]

Rotation of the crank, careful not to catch the chain, requiring three hands..is smooth and pistons travel is consistent.

Reluctant to dis-assemble much further...

 

[Mike_wilts]

Just to update this thread, I have successfully rebuild the head and re-assembled the engine and she runs...Having been busy I goto to the point where i just wanted the car back and running so re-built the head, fitted new cahin and cam gears..

Maybe some one can help, during the stripping down of the cylinder head i managed to break the 't' pipe which sits on top on fhe cylinder head vacuum pump..i've bodged a repair, but need to fit a replacement part or piece. anyone any ideas as to the part no im looking for..

the vauum hose comes from the bulkhead, to the vacuum pump to the pipe near the maf..

Many thanks for all of the input. overall i'm happy with my rebuild and the help here saved me a lot of head scratching..

 

[Gourockian]

Just to update this thread, I have successfully rebuild the head and re-assembled the engine and she runs...Having been busy I goto to the point where i just wanted the car back and running so re-built the head, fitted new cahin and cam gears..

Maybe some one can help, during the stripping down of the cylinder head i managed to break the 't' pipe which sits on top on fhe cylinder head vacuum pump..i've bodged a repair, but need to fit a replacement part or piece. anyone any ideas as to the part no im looking for..

the vauum hose comes from the bulkhead, to the vacuum pump to the pipe near the maf..

Many thanks for all of the input. overall i'm happy with my rebuild and the help here saved me a lot of head scratching..

Congratulations on getting your car running again, I'm in a similar position of needing to get my car back on the road after spending weeks without it. I've replaced the chain and tensioner and completed most of the reassembly, however I am stuck on trying to rivet the master link of the new chain. I've pressed the plate over the pins but I haven't been able to mushroom or crimp the pins over the plate. I was wondering if you could share your method of attaching the new chain?
Cheers

 

[Mike_wilts]

Hi Gourockian, i'd recommend an approprate tool. The method i used is a bit old school and don't really want to endorse the method, suffice to say that it involved some heavy steel and a big hammer. And a cold chisel (shaped). And i accept no responsibility! I wamted the car running and accept that it might end in disaster in a few miles...i'll be honest i didn't research the car before i bought it..call it an impulse..after the rebuild i'd lost a lot of love for it. The car dosen't owe me a huge amount of money and if she breaks..well, now it's running..it still might end in divorce! Thinking i'd be happier if i'd been a little more patient and sourced a crimping tool. I may do the chain again if i'm happy with the way the car is running and if my first attempt at a head gasket has been a success..

 

[Diddles87]

Hi, I think i have to do this exact repair to mine, just need to do a leak down to check the valves. Did you use genuine parts, im tempted to use parts from m271.com as they are much cheaper but unsure of what the quality will be like.

 

[Mike_wilts]

Hi, I think i have to do this exact repair to mine, just need to do a leak down to check the valves. Did you use genuine parts, im tempted to use parts from m271.com as they are much cheaper but unsure of what the quality will be like.

Hi Diddles,

I used M271.com for the parts for the rebuild. they were all supplied by m271. I'm no mechanic..but i'd say that the quality of these parts can't be any worse then the parts that were fitted from new. i'm guessing that most of the valves and gears are made in China anyway.. Gavin was really helpful and specialises in the parts for this engine and i had no concerns over the quality of the cam chain and gears (the most important bit in my view)

I think that when i costed the items needed initially, going for a more reputable brand made it cost prohibitive.

for the rebuild i needed the following:

Vacuum hose
inlet and exhaust valves
stem seals
also replaced some rockers as clips were fragile and couldn't source clips seperately
Head gasket
Timing gears
Cam Chain
Cam chain tensioner and blanking plug
Exhaust gasket
Loctite 7200 gasket remover
Loctite SF7063 part cleaner
MB Also recomend a Loctite silicone sealant for resealing upper cover and timing covers

your also going to loose most of antifreeze and I also opted to change the oil filter and oil.

I also broke the brake vacuum pipe at the back of the engine during the strip down and had to source a replacement from a breakers. I have also read somewhere that whilst the head is off to check the vacumm pump attached to the rear of the head for signs of leaking oil as this can cause a problem with rough idling.

I didn't use any specialised tooling but would recommend the use of a chain crimper. I'm looking for one of these as i now have another coupe and it's getting a new chain very soon!

I also pruchased a cheap ebay valve compression tool, best £10.00 ever spent! also a torque angle finder for the stage tightening process on the head. also you will need your lapping paste and stuff..

I wasn't horified by the cost of the parts through m271..thought that he was very fair and worth giving a call and having a chat with him.

I was quite suprised though how much the little assembly bits can add up to!!

Time wise, ignoring the strip down, to rebuild the cylinder head and re-assemble the engine took about 2 long days! but worth it! Think i could do this quicker the next time!!

 

[Petrol Pete]

Hi Diddles,

I used M271.com for the parts for the rebuild. they were all supplied by m271. I'm no mechanic..but i'd say that the quality of these parts can't be any worse then the parts that were fitted from new. i'm guessing that most of the valves and gears are made in China anyway.. Gavin was really helpful and specialises in the parts for this engine and i had no concerns over the quality of the cam chain and gears (the most important bit in my view)

I think that when i costed the items needed initially, going for a more reputable brand made it cost prohibitive.

for the rebuild i needed the following:

Vacuum hose
inlet and exhaust valves
stem seals
also replaced some rockers as clips were fragile and couldn't source clips seperately
Head gasket
Timing gears
Cam Chain
Cam chain tensioner and blanking plug
Exhaust gasket
Loctite 7200 gasket remover
Loctite SF7063 part cleaner
MB Also recomend a Loctite silicone sealant for resealing upper cover and timing covers

your also going to loose most of antifreeze and I also opted to change the oil filter and oil.

I also broke the brake vacuum pipe at the back of the engine during the strip down and had to source a replacement from a breakers. I have also read somewhere that whilst the head is off to check the vacumm pump attached to the rear of the head for signs of leaking oil as this can cause a problem with rough idling.

I didn't use any specialised tooling but would recommend the use of a chain crimper. I'm looking for one of these as i now have another coupe and it's getting a new chain very soon!

I also pruchased a cheap ebay valve compression tool, best £10.00 ever spent! also a torque angle finder for the stage tightening process on the head. also you will need your lapping paste and stuff..

I wasn't horified by the cost of the parts through m271..thought that he was very fair and worth giving a call and having a chat with him.

I was quite suprised though how much the little assembly bits can add up to!!

Time wise, ignoring the strip down, to rebuild the cylinder head and re-assemble the engine took about 2 long days! but worth it! Think i could do this quicker the next time!!

'NEXT TIME '!! you expecting it to go pop again soon ?

 

[Mike_wilts]

'NEXT TIME '!! you expecting it to go pop again soon ?

LOl..going to take me a while to trust this engine! i've since changed the car and i haven't checked this chain yet! at 96K the writing is on the wall!!

 

[Diddles87]

Hi Diddles,

I used M271.com for the parts for the rebuild. they were all supplied by m271. I'm no mechanic..but i'd say that the quality of these parts can't be any worse then the parts that were fitted from new. i'm guessing that most of the valves and gears are made in China anyway.. Gavin was really helpful and specialises in the parts for this engine and i had no concerns over the quality of the cam chain and gears (the most important bit in my view)

I think that when i costed the items needed initially, going for a more reputable brand made it cost prohibitive.

for the rebuild i needed the following:

Vacuum hose
inlet and exhaust valves
stem seals
also replaced some rockers as clips were fragile and couldn't source clips seperately
Head gasket
Timing gears
Cam Chain
Cam chain tensioner and blanking plug
Exhaust gasket
Loctite 7200 gasket remover
Loctite SF7063 part cleaner
MB Also recomend a Loctite silicone sealant for resealing upper cover and timing covers

your also going to loose most of antifreeze and I also opted to change the oil filter and oil.

I also broke the brake vacuum pipe at the back of the engine during the strip down and had to source a replacement from a breakers. I have also read somewhere that whilst the head is off to check the vacumm pump attached to the rear of the head for signs of leaking oil as this can cause a problem with rough idling.

I didn't use any specialised tooling but would recommend the use of a chain crimper. I'm looking for one of these as i now have another coupe and it's getting a new chain very soon!

I also pruchased a cheap ebay valve compression tool, best £10.00 ever spent! also a torque angle finder for the stage tightening process on the head. also you will need your lapping paste and stuff..

I wasn't horified by the cost of the parts through m271..thought that he was very fair and worth giving a call and having a chat with him.

I was quite suprised though how much the little assembly bits can add up to!!

Time wise, ignoring the strip down, to rebuild the cylinder head and re-assemble the engine took about 2 long days! but worth it! Think i could do this quicker the next time!!

Thanks for that, i priced up the parts with genuine parts and its well over a £1000 even with discount so im going to go with the m271.com parts

The car in question is my parents 2007 c class 200k which they have had since new and always been serviced and maintained to a high level. It's at 85,000 miles.
I did an oil and filter change and spark plugs on over the Easter weekend for them. 5 days later they phoned me saying it's miss firing. I doubled check the plugs, coils made sure all seals on the filter were ok. Found nothing wrong. I left and said I need to get my fault code scanner. They tried to start it again and no start.
Took the valve cover off and chain is slack.
They didn't want to pay for the repair as they are getting a GLC so they said its mine if i want to fix it.

Im taking out the camshafts and going yo carry out a leak down test to confirm bent valves. Fingers crossed they are ok but its skipped 3 teeth so im doubtfull.

Sent from my SM-G950F using Tapatalk

 

[Diddles87]

Took the camshaft out and done a leak down test, only cylinder one held any sort of pressure the rest showed 100% leakage, so defiently bent some valves.

I'm praying the pistons arent badly damaged as I really don't want this car to go to the scrappers.

 

[Diddles87]

Could 100% leakage be something worse than bent valves as its seems quite excessive.