Hello, my name is Gabriel and I'am from Brazil. Sorry for my english!

I'm rebuilding a M103 engine from a 1991 300TE and while reading the service manual I noticed that there is 3 diferent sizes of standard conrod bearing journals. Standard, Standard 1 and standard 2. For my rebuild I would need the standard 1 journal which are for a crankshaft with sizes between 47.945mm to 47.955mm But I cant find it on the internet.

Anyone knows if those journals are avaiable for sale nowadays, and where?

Thank you very much!

Welcome Autostsatt,

The parts you are seeking are commonly referred to as bearings or inserts in the US, not journals. This may help with the search.

The difference between the size you listed is .010 mm or .000394 ". That is a minute/ very small difference. Are you certain the standard size won't keep the clearance in specification?

Common manufacturers/vendors are TRW, Federal Mogul. You may also get results under Sealed Power. A search on Clevite may also help.


My daily driver is a '91 TE with 320k miles.

Good luck!!!

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Check Pelican Parts the sponsor of this site first. They are on eBay, do a search on King bearings M103.

Good luck!!!

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Exactly

the conrod bearing to crank clearance is listed as 0.02-0.04 mm so there's a good chance that the standard bearing will fit just fine.

But what is the reason for replacing the original bearings? if they look good I would just put them back in

Hello,

I have tried searching for bearings too with no success (Only found the std 48mm and repair sizes, but not STD 1 and STD 2 which are listed in the service manual.)

My crankshaft is measuring 47,949mm using a micrometer. With the original bearings that are in the engine, the clearance is at 0,06mm which off from whats is listed in the service manual and its causing me a low oil pressure situation when hot and noise in the lower part of the engine.

By my searching on the internet, I understand that std bearings have 48 milimeters internal diameter, which would give me a 0,05 clearance. Still off from specs

Following the service manual, STD 1 bearings would be the perfect choice for my engine since they are made for crankshafts with diameters between 47,955 to 47,945.

I know I could just send my crankshaft to a machine shop to get resize in a smaller size and use the 1st repair size bearings, but my crankshaft is perfectly round and with no scratches. And I know that the machining quality from a machine shop will never get close to the machining made by mercedes.

Thanks again for your attention!

.25 mm oversize bearings are listed on eBay. Search on King bearings M103.

Good luck!!!

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer