Need more Om606 stretch bolt advice.
Need more Om606 stretch bolt advice.
1998 w210 e300 TD: egr delete, muffler delete, amg 18s, I love this car!
1995 w124 e300 diesel: bolted on junkyard w210 turbo.. yes you can "easily" boost your om606na! RIP
1991 w201: putting the om606 na to turbo into this. Not enough hours in the day!
BoostedW124
04-11-2017, 09:59 PM #1I followed the instructions precisely how to torque head bolts. 15 nm 25nm 35nm 90degrees 10 min 90 degrees. Some just felt like they took more oomph at the final 90 degrees and other didn't feel quite as tight giving that distinct "stretch" feedback. I even marked bolt heads with white paint as a reference point for the final 180 degrees. Should I give it one more final run through the sequence giving the ones not as tight a few more degrees. Has anyone experienced this? Just want to make sure thank you again.
1998 w210 e300 TD: egr delete, muffler delete, amg 18s, I love this car!
1995 w124 e300 diesel: bolted on junkyard w210 turbo.. yes you can "easily" boost your om606na! RIP
1991 w201: putting the om606 na to turbo into this. Not enough hours in the day!
But I am not sure, let's hear other opinions
Evgeniy1987
04-12-2017, 01:58 AM #2It is difficult to say... but I think, that is exactly the reason that the specifications works with degrees instead of Nm. Because If you would use the torque wrench for the last steps, you for sure would have different stretches.
But I am not sure, let's hear other opinions
If the bolts and bolt holes were cleaned properly and you're absolutely positive you followed the sequence correctly you shouldn't have any problems, just leave it be. If you have any doubts at all you should re-torque them. You have a few options: 1) measure bolt stretch and re-use bolts or 2) spring for all new bolts(most foolproof). I only replaced head bolts on engine/head gasket jobs where the engine was overheated. Make sure the bolt holes are sparkling clean when the bolts go back in. I always blew them out with compressed air, sprayed liberally with brake cleaner, & blew out with compressed air again. I also applied a light coat of WD-40 to the threads and under the bolt head where it contacts the head so there was less friction when being tightened. Just having to do 90deg turns isn't a big deal but it may be wise to buy/rent/borrow an angle gauge to be completely sure. In extreme cases I also had printed instructions on the fender and/or numbered the bolt heads to eliminate any confusion, it also made the job a tad quicker. Good luck
(04-13-2017, 04:33 AM)the D ... I also applied a light coat of WD-40 to the threads and under the bolt head where it contacts the head so there was less friction when being tightened....
I know that people often do that, but be careful. If the tightening torque is specified WITH friction, you will easily overtighten the bolts.
Evgeniy1987
04-13-2017, 12:49 PM #5(04-13-2017, 04:33 AM)the D ... I also applied a light coat of WD-40 to the threads and under the bolt head where it contacts the head so there was less friction when being tightened....
I know that people often do that, but be careful. If the tightening torque is specified WITH friction, you will easily overtighten the bolts.
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Ex: 525tds 130kW, C250TD 160kW, E320CDI 200kW, ML400CDI 230kW, A6 R5TDI 130kW
Now: Q7 V8TDI 240kW, 320d 150kW, 335d 210kW
Manual specifies to ligtly coat threads and area between washer and bolt with clean engine oil.. Use 30W oil.
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Ex: 525tds 130kW, C250TD 160kW, E320CDI 200kW, ML400CDI 230kW, A6 R5TDI 130kW
Now: Q7 V8TDI 240kW, 320d 150kW, 335d 210kW
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