Help on Camshaft cap nuts
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tomasb

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Help on Camshaft cap nuts
« on: February 21, 2022, 10:03:57 PM »
Hello,

Im just wondering if you can help me. I've been rebuilding my engine M42B18 and before i disassembled the camshaft cap nuts were far down on the threads, but ihad to replace the head by a new one because mine was cracked, and now after assembling the new head on the block and the cams on the new head then i torqued the nuts (15Nm) they stay almoast at the surface and Im wondering if i´ve missed something in the way because it seems a little strange :-X.
Note: hidraulic liffters were out for like 3 months, and when i put them back in i cleaned them of the old oil and passed some new oil and slided back into the cam suport.
Here is the picture 1 before and picture 2 after.(could liffters be causing too much stress on nuts?)
Thanks
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Warsteiner

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Re: Help on Camshaft cap nuts
« Reply #1 on: February 23, 2022, 08:03:22 AM »
tomasb,

Did you by any chance tighten the lower ones first and then try to tighten the upper ones after? These need to be tightened by alternating cylinders and in a very slow fashion. It looks like you have too much torque and if you try to tighten the upper any more you may snap your cam.

My suggestion would be to loosen all of them and start over. Make sure They are A on the exhaust and in the correct order.

Cheers,
~Ralph
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tomasb

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Re: Help on Camshaft cap nuts
« Reply #2 on: March 03, 2022, 02:40:18 PM »
Hey, i have tighten them all in the same time turn at turn cross patern always  from middle to the outside.
I have tried to start the car today after the new head gasket, head and valves. The engine runs very poorly, shuts off without throttle oil burning smell and some smoke coming from engine bay.
Through the valve cover cap i checked and cams are still on timing with cranck and i think i have already checked the eletrical and ruber tube conections, i dont know were to start diagnosing this problem  :-\ :-\ :-\
Runned good before disassembling.
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Warsteiner

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Re: Help on Camshaft cap nuts
« Reply #3 on: March 04, 2022, 12:07:13 PM »
tomasb,

I'm going to guess that you had a complete head rebuild? valve guides and all?

I'm not sure how you can tell that your cams are in time with your crank from the oil cap but ok.

Have you done a compression test or leak down test? If not you can start there.

You can also check to make sure that your plug wires are in the correct cylinders.

It could also be that you're off by a tooth or more on your timing chain. It could have slipped during installation.

I would pull the spark plug in cylinder #1 and put a long screwdriver in there and bring it to top dead center. Then I would check the reference mark on the crank pulley. See if the marks line up on the pulley.

Cheers,
~Ralph
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