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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-30-2021, 07:35 PM
Registered User
 
Join Date: Jun 2021
Location: SWFL
Posts: 12
Aluminum Cylinder Head Prep?

Now that I have the head off my 3.5 OM603, I need to prep the surfaces for the new gasket. Block is easy using razor blade and shaving cream to prevent debris in holes.

I’ve been using the same tactic for the cylinder head. I used Goof Off, razor blade and brake clean.

I’ve done roughly two and a half cylinder areas. I’m thinking this isn’t clean enough. Am I being too picky, or should I go to the other coast and look for a machine shop?

Aluminum Cylinder Head Prep?-1f85ef93-baa7-4c58-8047-0853b7fced89.jpg

__________________
1982 300SD- Flatface wheels, double din, 6 Speakers w/amp under passenger kick panel, Buzzer to chime conversion

1995 S350D- Rebuilt rod bender, OM606 rotary vacuum pump conversion
Reply With Quote
  #2  
Old 06-30-2021, 10:07 PM
Registered User
 
Join Date: Aug 2019
Posts: 949
For aluminum use only Plastic razor blades (steel can create grooves in aluminum). Then with 180 grit on a sanding block you clean it all up.

Or just take it to the machine shop. They may even "clean it up" to a proper Ra surface roughness. Although then you will have to take out the prechambers. Or pay them to do it
Reply With Quote
  #3  
Old 06-30-2021, 11:25 PM
Registered User
 
Join Date: Sep 2001
Posts: 2,765
If they are stains in the metal it is fine, if it is raised and you can feel it isn't ok.

The Ra (roughness average) matters. If the surface is too smooth like a mirror the gasket will leak. Discuss with the machinist if going that route.

Good luck!!!
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
Reply With Quote
  #4  
Old 07-01-2021, 03:12 AM
Registered User
 
Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 8,065
Check for flatness and reinstall it. Having a diesel head resurfaced should be avoided. It also required pulling the prechambers which is a PITA.
__________________
CENSORED due to not family friendly words
Reply With Quote
  #5  
Old 07-01-2021, 11:18 AM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,042
This could be a repeat as I did not read the other posts.

I have used this for many years: CRC Gasket Remover. No. 05021, Item 1003638
Of course other companies make a similar product. It will also remove paint so be careful of that.

After spraying and letting it soak in you can use plastic, hard wood, dull steel (like butter knife dull) and brass or stainless steel hand wire brushes used by hand to get it off.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #6  
Old 07-01-2021, 11:25 AM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,042
Note before re-surfacing a Cylinder head with pre-chambers that protrude you need to measure the protrusion/the amount sticking out for reference. It will help you pic which thickness of seal ring you might need.

When they are installed you also need to measure the pre-chamber protrusion to be sure it does not stick out too far.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #7  
Old 07-01-2021, 12:45 PM
Registered User
 
Join Date: Apr 2021
Posts: 11
Quote:
Originally Posted by Diesel911 View Post
This could be a repeat as I did not read the other posts.
.
?????
Reply With Quote
  #8  
Old 07-01-2021, 02:43 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,042
Quote:
Originally Posted by JohnLeCar View Post
?????
I was in a hurry to post so did not read what others had said previously.

If I posted new info fine if I posted info someone else said it is because I did not read the other posts. Seems clear to me.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #9  
Old 07-01-2021, 08:25 PM
Registered User
 
Join Date: Jun 2021
Location: SWFL
Posts: 12
Thank all!

Deep discoloration is actually corrosion.

Since I got it pretty smooth with the razor blade and goof off (really nasty stuff!), I’m just going to clean up the block deck, and slap it on with a new gasket. Guess I’ll update after it's running.

Original gasket was intact upon removal. I had to lift the head due to a destroyed chain tensioner rail.
__________________
1982 300SD- Flatface wheels, double din, 6 Speakers w/amp under passenger kick panel, Buzzer to chime conversion

1995 S350D- Rebuilt rod bender, OM606 rotary vacuum pump conversion
Reply With Quote
  #10  
Old 07-01-2021, 09:19 PM
Registered User
 
Join Date: Aug 2010
Location: Sacramento, CA
Posts: 3,115
If the prechambers don't protrude past the surface (hard to tell in photos), I wouldn't be afraid to sand it with 400 grit. Search for they youtube by OldSkoolFunk. You need a thick piece of glass to spray-adhesive the sandpaper to. I would jam paper in the oil passages first, to pull out debris with the paper. Chemicals which might help are "fireplace window soot remover" and phosphoric acid. The later removes oxides and slightly etches bare aluminum (good for painting). You can buy it for concrete etching at Home Depot, or is in some of the rust-remover sprays.
__________________
1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans
Reply With Quote
  #11  
Old 07-01-2021, 09:21 PM
Registered User
 
Join Date: Jun 2021
Location: SWFL
Posts: 12
Quote:
Originally Posted by BillGrissom View Post
If the prechambers don't protrude past the surface (hard to tell in photos), I wouldn't be afraid to sand it with 400 grit. Search for they youtube by OldSkoolFunk. You need a thick piece of glass to spray-adhesive the sandpaper to. I would jam paper in the oil passages first, to pull out debris with the paper. Chemicals which might help are "fireplace window soot remover" and phosphoric acid. The later removes oxides and slightly etches bare aluminum (good for painting). You can buy it for concrete etching at Home Depot, or is in some of the rust-remover sprays.
I would do that, but the prechambers protrude quite a bit. I don’t have the tools or experience to pull them either...
__________________
1982 300SD- Flatface wheels, double din, 6 Speakers w/amp under passenger kick panel, Buzzer to chime conversion

1995 S350D- Rebuilt rod bender, OM606 rotary vacuum pump conversion
Reply With Quote
  #12  
Old 07-02-2021, 04:03 PM
Registered User
 
Join Date: Sep 2007
Location: Calgary Alberta Canada
Posts: 1,924
Was the head checked for flatness?

__________________
92 e300d2.5t
01 e320
05 cdi
85 chev c10
Reply With Quote
Reply

Bookmarks

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 06:39 AM.


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