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**select** · 10-01-2017, 11:55 PM

Originally posted by Chad

not sure if std m3 has this?

No, CSL had special inlet valves

Originally posted by Chad

Potential problem I've noticed sticking chain tensioner piston. This one is not smooth in operation anybody ever had to replace on ??

My mechanic advised me on replacing it while he did treated my VANOS with Beisan stuff. I can ask him what is his take on it? But from what i remember this part is only around 80 pounds.. so not that expensive.

The picture of the inlet valves is worrying, it looks like metal flakes?

**Chad** · 10-02-2017, 12:36 AM

Originally posted by select View Post

No, CSL had special inlet valves

My mechanic advised me on replacing it while he did treated my VANOS with Beisan stuff. I can ask him what is his take on it? But from what i remember this part is only around 80 pounds.. so not that expensive.

The picture of the inlet valves is worrying, it looks like metal flakes?

Hi select , not flakes just dust. Head has been lying around to long collecting dust :thumbs: I definitely think these tensioners could be future problem sticking, giving rise to loose chain issues.

**select** · 10-02-2017, 04:02 AM

Seeing as how you are doing extensive work to the engine anyway, i would just go ahead and replace it. If you need it i can see if i can provide you with the partnumber. Let me know.

**GregorFuk** · 10-02-2017, 07:20 AM

Originally posted by select View Post

No, CSL had special inlet valves

I think Chad was referring to what looks like porting work on the inlet side of the head. I read something a long time ago that CSL heads were given some hand finishing (A bit like Honda Type-R engines back in the day). I don't know how true it is though and I've never seen a normal M3 head side by side with a CSL head. Would be interested to know.

**Chad** · 10-02-2017, 08:17 AM

Originally posted by select View Post

Seeing as how you are doing extensive work to the engine anyway, i would just go ahead and replace it. If you need it i can see if i can provide you with the partnumber. Let me know.

Hi Julian, this is a bit of fun for me, more research and practice run than anything else, for when I do my motor, this is a spare engine we have from my lads car, he bought new motor from BMW , as this one previously spun a shell , but it all looks not to bad considering it did 100k , will be doing a few practice rebuilds with this one:thumbs:

**select** · 10-02-2017, 12:31 PM

Originally posted by GregorFuk View Post

I think Chad was referring to what looks like porting work on the inlet side of the head. I read something a long time ago that CSL heads were given some hand finishing (A bit like Honda Type-R engines back in the day). I don't know how true it is though and I've never seen a normal M3 head side by side with a CSL head. Would be interested to know.

You are correct, i did not read correctly.

Yes CSL had ported/polished inlet side to match the better designed inlet valves. Exhaust side is as far as i am concered the same as normal m3.

Originally posted by Chad View Post

Hi Julian, this is a bit of fun for me, more research and practice run than anything else, for when I do my motor, this is a spare engine we have from my lads car, he bought new motor from BMW , as this one previously spun a shell , but it all looks not to bad considering it did 100k , will be doing a few practice rebuilds with this one:thumbs:

I am very jealous of your project and i have much respect for you rebuilding the engine :thumbs:

To be honest i am not very surprised that it spun a bearing shell. They should be replaced every 60k miles, if its been driven like its meant to be, in my opinion.

**uncle benz** · 10-03-2017, 08:23 AM

The inlet valves are the same as regular m3, it's the exhaust valves that are different. Port work is the same as regular S54 too.

Old thread - http://www.cslregister.com/forum/showthread.php?t=12153

Sadly I can't restore the photobucket pics, despite my best efforts :bigcry:

**select** · 10-05-2017, 06:53 AM

Yes, seems like i was mistaken. Thanks uncle benz

**Chad** · 10-15-2017, 08:14 AM

My version of a water leak down test while striped, only no 5 hardly leaked number 4 was the worst, pics taken after a 3 minutes. Will lightly lap all the valves in and re try them again

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**Chad** · 10-19-2017, 01:22 PM

Bought a new toy, make life easier to build motor. so thought I’d start practice rebuild of engine, from bare block up, crank back in, rods N pistons, next job lap in valves on head, cure them leaky valves. Got to say ring compressor is crap. Made the job to slow, and I chipped oil ring so left it out for now , know better next time don’t buy crap .anybody recommend a decent one???

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**Chad** · 10-28-2017, 12:01 PM

Valves out cyl 3 +4

If of interest to anybody, After my water version leak down test ...valves out of 3and 4 cylinders just to take a look,,, inlet look almost spotless, exhaust looking pretty crappy on the valve face. , But no obvious lapped or ground angel on exhaust valves, this was a new cylinder head that was fitted by bmw, at about 70 k, I’m really not sure if when they supply a new head, it comes completely assembled, Or they assembly in workshop with original valves etc ,,but no obvious sign that they ever got lapped in on rebuild,:banghead: Or even did a proper job on shimming, as they were almost all, way out from memory, It did run ok ish , but could have been a lot better if done properly imo, but fair play to the lads ,am sure they don’t get much time to spend on this type of head rebuild,,... my local Nissan dealers outsource head rebuilds shame on them,, , But lad being what he is, went and bought a new brand new motor from bmw,,leaving this one to play with...:smokin: few pictures. Inlet porting looks ace...

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