Is that some sort of coating they were applying on them? there was an article many years back comparing the Tecumseh to the raptor when Tec was getting into the Kart racing, It predates our version engines but there was a statement in the article "Tecumseh claims to be developing a high-tech plasma coating for bearing surfaces for all future engines". Dunno if it actually got done or not. I haven't cut the sealed plastic heat shrinking off the bearings on the 9994 I recently bought yet, but they look to have the dark coating on the inside surface only from what I can see.
SBH-9993 H50
- Thread starter mustangfrank
- Start date
That has to be it... it seemed hard as heck to make a mark in it.. just a light snug down on the rod cap on mine and it locked the crank down hard..
Man that coating looks rough, I guess you gotta hone it to the size you want or something. Last MS engine I had was used, and the bearings that were in it along with a spare set that came with were just the standard size that the briggs used no coating. Soon as I can get some room I wanna pull that engine out and get into it and see.
Off topic, is that a Horstman/Krizman spark arrestor I spy sitting there???
Those are way cool, I have one in the cabinet collecting dust, someday I'll use it.
Man that coating looks rough, I guess you gotta hone it to the size you want or something. Last MS engine I had was used, and the bearings that were in it along with a spare set that came with were just the standard size that the briggs used no coating. Soon as I can get some room I wanna pull that engine out and get into it and see.
Off topic, is that a Horstman/Krizman spark arrestor I spy sitting there??? Those are way cool, I have one in the cabinet collecting dust, someday I'll use it.
View attachment 273414
Off topic, is that a Horstman/Krizman spark arrestor I spy sitting there???
Those are way cool, I have one in the cabinet collecting dust, someday I'll use it.
View attachment 273414
@Studeman68 An OHH motorsports engine I ordered rolled in the door while I was doing the block work on someone's HS40 I am rebuilding. The bearings (same bearings as whats used on the H50 size MS engine) were just in a box and not sealed and the coating was super thick and chipping off....Like really thick! That is a chunk of it in the calipers and piece of it at the tip of the screwdriver:
I use a flex hone to prep/cross hatch the rod, and block/sidecover bores so since the tools were out for the HS40 prep and I was dirty, I fitted them into the rod and ran the hone through with just a couple fast passes after chipping off the loose overcoating with no problems and still well within the specs in the book.
I use a flex hone to prep/cross hatch the rod, and block/sidecover bores so since the tools were out for the HS40 prep and I was dirty, I fitted them into the rod and ran the hone through with just a couple fast passes after chipping off the loose overcoating with no problems and still well within the specs in the book.
That's crazy. On mine I couldn't get the coating to come off, it was hard as heck. I ended up figuring out the correct bearing from ARC and went that route.
I still have those bearings, I may re-try removing that material
I still have those bearings, I may re-try removing that material
