Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 08-05-2008, 07:49 PM
Boinkers's Avatar
Registered User
Join Date: Aug 2008
Location: Sweden
Posts: 5
M104 Tappet noise after rebuild

Hi all.

I have been reading a lot of threads w/regards to noisy tappets. Alas, I haven't really found a good answer as to why my engine sounds like someone has put gravel in it, so I'll give it a try here and see what you might think. The engine in question is a Brabus m104.98x 3.6.

Story so far: Decided to replace valve guidances, engine was smoking badly under acc. and not running very well in general. Took the head off, sent it to a local firm for new valve guides and the usual planing and so on. Put the whole thing back together and started it: klack-klack-rattle-bang, crash...let the engine run warm, no improvement.

Ok, so I thought, fine, I'll need new tappets, bought them (expensive little buggers) off with the cams again, changed them, managed to snap the exhaust cam off into 3 pieces (actually, it wasn't me who did that, but anyway) when rebuilding, again...looking for info on what cam is used in a Brabus engine, thankfully Brabus told me it was a standard exhaust cam, only inlet cam is modified, so, bnought one from a junkyard and assembled the whole thing again.

Klack-klack-rattle-bang, crash, well, you get the idea...

Oil pressure is good, changed oil 2 times lately, not using any fancy synthetic stuff, but it should be ok once the engine warms up, right? Well, no. Noise is still there after warm engine. It is a BAD noise, not subtle at all.

It is not the deep clacking noise from a bad crankshaft either, one thing I WILL check tomorrow is if the noise might come from the timing chain, although I don't think so.

A question: where and how is the oil supposed to enter into the tappets? I know they have a little hole in them on the side, but how does the oil gets there in the first place? Any hoses I might need to check?

Any/all ideas will be accepted with gratitude.


Reply With Quote
Old 08-05-2008, 08:54 PM
bobs's Avatar
Registered User
Join Date: May 2007
Location: Richmond, VA
Posts: 310
I'm sure others will add to this, but I believe there's some kind of reset procedure you have to do on the timing chain tensioner on the M104. You might want to check the tension on the chain.
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles
Reply With Quote
Old 08-06-2008, 11:48 AM
Registered User
Join Date: Mar 2006
Location: Australia
Posts: 115
Took the head off, sent it to a local firm for new valve guides and the usual planing and so on.
Planing? I hope you didn't shave the head?

Is it possible that the timing chain is one cog out?

(As an aside...Why aren't you using the best quality synthetic oil?)
Reply With Quote
Old 08-06-2008, 12:00 PM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
the timing chain tensioner has to come apart as it is a ratchet,you have to take the piston all the way forward and then put it in from the rear of the tensioner and as you tighten it back down the tensioner will set itself.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
Reply With Quote
Old 08-26-2008, 07:15 PM
Boinkers's Avatar
Registered User
Join Date: Aug 2008
Location: Sweden
Posts: 5
Thanks all for your input. I have bought a new timing chain tensioner, chain was not tense enough, the old tensioner was a bit limp (even after reassembly the correct way). We'll see if this'll help.

Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 02:52 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page