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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, May-03-2019, 09:45:20 PM   #31
zingbmw
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Default Re: Help removing head

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Originally Posted by sapote View Post
All the EX valves were not hitting the pistons, but they hit their mates IN valves instead!!!
This makes sense because only the IN cam bolts were sheared and the EX cam was in perfect timing.

Interesting that #1 two IN valves supposed to move in sync and hit the piston with same intensity and damage but why pic shows only the inner valve with damage and the outer valve sit lower.

The piston damage is not bad as I thought, so I think the bottom end is ok to be used as is.
the inner valve is sitting lower and there is damage on the inner valve side of the piston.

What are my options with the block? Can I easily remove just one piston without dropping the engine or do i have to drop the engine to remove the piston? Can I have someone machine the piston as it sits?

If the engine must be dropped in order to repair or replace the piston, what possible issues could I run into with just leaving the piston as is?
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Old Sat, May-04-2019, 12:10:45 AM   #32
sapote
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Default Re: Help removing head

Why you need to change the slightly ding piston? I don't see the impact force was big enough to concern. (With a helper feeding the chain, you turn the crank CW looking rearward to feel any high spot during turning. Also turn to have each piston at its highest and compare this measurement to the other pistons; any difference indicates a bent rod or piston pin.)

If you need to change one piston, just remove the conrod bearing cap then pull the piston/rod up out.
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Old Sat, May-04-2019, 12:19:14 AM   #33
sapote
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Default Re: Help removing head

How many miles on engine and do you feel the cylinder wall top ridge (smooth or step), and what condition of the cylinder honed cross lines?
My e46 323i cylinder wall still had clear hone lines and no detectable ridge at 160K miles.
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Old Sun, May-05-2019, 07:42:41 PM   #34
zingbmw
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Default Re: Help removing head

thanks sapote. any other opinions on the piston? Will see what the local head shops say about the piston tomorrow.
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Old Tue, May-14-2019, 07:28:24 PM   #35
zingbmw
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Default Re: Help removing head

should I leave the piston as is, clean it up, or have it replaced? It would probably be ~1000 in labor to replace it with the head already off.
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Old Tue, May-14-2019, 08:30:24 PM   #36
sapote
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Default Re: Help removing head

I would just leave the pistons as is.

...do you feel the cylinder wall top ridge (smooth or step), and what condition of the cylinder honed cross lines?
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Old Tue, May-14-2019, 08:31:00 PM   #37
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Default Re: Help removing head

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Originally Posted by sapote View Post
I would just leave the pistons as is.


Me too


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Old Wed, May-15-2019, 01:14:34 AM   #38
black bnr32
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Default Re: Help removing head

I left my pistons as is when it happened to me. Just cleaned them and sanded down any sharp edges. Then put some new valves in and lapped them. Every thing else in mine was in good shape and in spec. Guides, valve seats, etc.

I used this valve spring compressor: https://www.princessauto.com/en/deta...or/A-p8003725e

Last edited by black bnr32; Wed, May-15-2019 at 01:21:04 AM.
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Old Wed, May-22-2019, 12:07:22 AM   #39
zingbmw
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Default Re: Help removing head

Sounds good thanks guys!! Will sand it a little and clean it up. How did you guys go about cleaning the carbon and oil off the pistons?

Will work on cleaning the pistons, while the machine shop is fixing the head. Was quoted 650 for labor plus parts. Any good source for valves and any other parts Ill need to source for the shop to replace? was considering picking up a used head for parts if they tell me that most of the valves are bent. Used heads seem to run ~500 on ebay.

Any good post detailing all the washer, gaskets, ect that I will need to put it all back together or maybe a kit including everything from someone like ecs?

Last edited by zingbmw; Wed, May-22-2019 at 12:18:39 AM.
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Discussing Help removing head in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)