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E34 (1989 - 1995)

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  #1  
Old 01-28-2013, 03:15 PM
Bugsie Bugsie is offline
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Mein Auto: BMW E34 M50 2.5
To lock or not camshaft and flywheel for head gasket replacement

Hi everybody.

About to start my head gasket but got a minor doubt.

I will send the assembled head (with cams, valves, everything) to the shop for proper treatment.

After some thinking, and after read Bentleys, I got confused.

To ship the assembled head, do I need to lock the cam while removing the head?? And the flywheel?? Must I locked it if I need to turn the motor to clean the piston head??

To remove it makes sense to lock the flywheel, but I don't see why locked the cams??

Can anyone clear me on this??

Best regards

Fernando
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  #2  
Old 01-28-2013, 03:42 PM
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Monsignor Monsignor is offline
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The lock has to do with timing. If the head is being sent out to a machinist who WILL disassemble it, then locking it serves no purpose.

When you reassemble, place head on block without cams, motor at tdc, lock flywheel, then install and time cams.

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  #3  
Old 01-28-2013, 09:03 PM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
Set the engine to TDC No1 compressing B 4 you take it to bits. Take photos - a lot of photos. If you rotate the engine while the head is away keep a little tension on the timing chain (use a mate to help). As Monsignor said, the head will have been in pieces so you will have to ensure its timing marks and the engine ones are aligned correctly B 4 you lock on the chain. Easier than it sounds - how many spanner pushers have got engineering degrees? Just take it steady and refer to your photo's and notes.
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  #4  
Old 01-29-2013, 06:16 AM
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Monsignor Monsignor is offline
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Quote:
Originally Posted by BMWFatherFigure View Post
Set the engine to TDC No1 compressing B 4 you take it to bits. Take photos - a lot of photos. If you rotate the engine while the head is away keep a little tension on the timing chain (use a mate to help). As Monsignor said, the head will have been in pieces so you will have to ensure its timing marks and the engine ones are aligned correctly B 4 you lock on the chain. Easier than it sounds - how many spanner pushers have got engineering degrees? Just take it steady and refer to your photo's and notes.
EGGGSACTLY

Set motor to TDC (simple on M50s, line up dashs on block and crank) and put in the flywheel pin locking it. Leave a giant sign on the hood or windshield or dash (or all three) reminding you that the pin is in there so you dont forget

Then remove head and ship it out.

When it comes back, install head (Without cams as they may not be timed properly; do not want to torque your head down with valve contact!!!!)

Then install and time cams in the installed head, motor should still be locked at TDC. Remove all locking mechanisms and triple, even quadruple check everything. EVERYTHING.

Enjoy your motor.
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  #5  
Old 01-29-2013, 06:18 AM
coolredlich coolredlich is offline
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When I rebuilt my 525i head I went to pelicanparts.com. Go to the technical advice page scroll down to head gasket replace. The procedure is well defined. Also, read the tech article on camshaft removal, very important! The cams are hollow and will break if improperly removed.
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  #6  
Old 01-29-2013, 06:24 AM
coolredlich coolredlich is offline
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Location: sutherlin, oregon
 
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As per advice from Monsignor, Tape large note about flywheel lock pin. I forgot to remove pin, tip snapped off upon engine start up. It is very difficult and time consuming to remove the broken piece.
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  #7  
Old 01-29-2013, 06:48 AM
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Monsignor Monsignor is offline
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what a terrible experience.

My (ex) girlfriend said to me before I fired mine "wait, about about that thingy you jammed in there..."

She failed to remind me about the cam sproket chian tensioner pin. Good thing there was no damage there.
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  #8  
Old 01-31-2013, 03:47 AM
Bugsie Bugsie is offline
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Hi everybody,

Thank you so much for all the help. After reading all your posts, also pelican ones, I figured it out this way:

I will lock the flywheel for removal. Afterwards, to install, engine n1 TDC, lock and time cams. Sounds good.

Couple (or so) of questions:

- Can I get something to replace the flywheel pin??Must it be the special tool or is it feasible to "build"??

- Besides photos, I really haven't seen an M50 open. As far as my "engineering" goes, I have to time the cams between them (exhaust and admission) and after that time them with the crankshaft to avoid valve contact.
The secondary chain will fill the purpose of keep the timing between cams, correct? For back saving, is it possible to time the cams between them outside of the motor, lock the motor at #1 TDC and then install the head and lock the primary chain??

- If I follow the above procedure, and as far as I've read for the cam removal, is it less prone to break on putting the cams on??

- Can I have the head shipped back to me with just the cams off??

- It's almost impossible to rent the special tools. Can I "build" a tool to lock the cams, or can I get along with something to make sure that the lobes are levelled??

Also. thanks for the tip of photos and notes. Appreciate.

Thanks for all the support.

Best regards

Fernando
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  #9  
Old 01-31-2013, 05:08 AM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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I can't speak to the rebuild process, but here is a thread where people made their own tools and I think a cam lock tool is included.

http://forums.bimmerforums.com/forum....php?t=1381270

Hope this helps.
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  #10  
Old 01-31-2013, 05:35 AM
coolredlich coolredlich is offline
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For the cmshaft locking tool, I used a piece of 3/4" hardwood and cut the slots with a table saw. Worked very well.
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  #11  
Old 01-31-2013, 08:13 AM
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Monsignor Monsignor is offline
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i'll take a measure of my bmw flywheel pin so you can have it machined.

When you take it apart, it all becomes readily apparent how it works. I did mine in an evening and it wasnt even dificult. It was tons of fun.
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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

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  #12  
Old 01-31-2013, 01:56 PM
Bugsie Bugsie is offline
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Mein Auto: BMW E34 M50 2.5
Hi everybody,

the wood block it's a nice trick. I'll try to find the special tool to deal with the wood.

I've read quite a few articles about the subject and it appears quite feasible. I think I'll "build" several DIY's on several matters with photos. It's also a nice way to put everything back together.

The fun part will go to the shop. But I'm concerned about camshaft removal.

Cheers

Fernando
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  #13  
Old 01-31-2013, 02:46 PM
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Monsignor Monsignor is offline
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Location: Pineapple Under the Sea
 
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Mein Auto: M50 Big Body
The first time I ever dealt with a cam was on my M50. Follow pelicans article, youll be fine. Quarter turn each nut moving frim the far sides to the center over amd over until they are off

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1995 525iA 250k mi
2006 325i/6 57k mi
2003 350Z 88k mi

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