|
|
|
|
|
|
|
#1
01-09-2004, 04:23 PM
|
|||
|
|||
M104 timing-cover sealantL: Loctite 5900 vs "The Right Stuff"
I'm getting ready to re-seal the M104/C36 front timing-cover (and replace the headgasket).
I noticed that Loctite 5900 (oxime silicone rubber) is specificed in the MB TSB as the sealant of choice for the front timing-cover gasket of M103 and M104 engines (maybe even other engines as well). After reviewing the Technical Data Sheet between Loctite 5900 and "The Right Stuff" (elastomeric rubber), it seems to me that "The Right Stuff" is a better front timing-cover sealant, since it is inherantly resistant to engine oil (15w50 and 5w30), compared to Loctite 5900 which has only 75% of initial strength after 500 hrs of use in engine oil. I'm wondering if this is one reason why "all M104 & M103" engines over time leak at the front timing-cover . . . My MB independent swears by "The Right Stuff" for valve, diff covers, and this application, and Permatex/Loctite claims "the Right Stuff" is now OE for most major automotive manufactures, including DaimlerChrysler. "The Right Stuff" http://www.permatex.com/right_stuff/right_stuff1.asp http://www.permatex.com/MSDS_data/tds_industrial/29247.pdf http://www.permatex.com/MSDS_data/msds_files/99070.pdf Loctite 5900 aka, Permatex "Ultra Gray" http://content.loctite-europe.com/wwdh/us/p3365900.htm http://www.permatex.com/MSDS_data/msds_files/82194.pdf Comments? :-) neil 1988 360TE AMG 1993 500E 
|
|
#2
01-09-2004, 05:00 PM
|
|||
|
|||
|
MB didn"t start with Loctite 5900 until 1997! M103 & M104's were history at that point!
Have seen thousands of M112 & M113 engines and almost no leaks. BOTH of those engines have very few gaskets & use Loctite 5900 only, from the factory.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
|
|
#3
01-09-2004, 07:39 PM
|
||||
|
||||
|
5900 all the way or "you'll be sorrrrryyyyyy!"
Let it sit for a minumum of 2 hours before starting the engine, ideally I'd reassemble it in the afternoon, push it out and let it cure until the next day, the longer the better. Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
|
|
#5
01-10-2004, 06:25 AM
|
||||
|
||||
|
Yes, back in the corners before you install the lipseal (down in the end of the groove on top of the lower cover) and also where the cover mates with the front of the head.
Gilly
__________________
Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)
|
|
#6
01-10-2004, 07:18 AM
|
||||
|
||||
|
It is my opinion that the way the 5900 sets up was a determining factor in it's selection. Other types of sealants do not harden like the 5900 and they are easier to peel off. You do not want the stuff that could peel off to end up in the oil system
 .
__________________
Jim
|
 |
| Bookmarks |
|
|
Hybrid Mode
