Seized 2276 - rebuild advice please

[Dan Ruddock]

Evan, How do you like the 252? Enough low end for you? I know you were concerned about that when you changed your mind away from the 86a. How quiet is the combo?
Dan

[evanfrucht]

[55rag]

I measured my #1 and #3 bearings again today and they are both at 2.1690 with the journals at 2.1645 so my clearance is .0045 which is at the high side of being in spec. Should I find another set of bearings or is this gap acceptable?
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[55rag]

Also, I was going through my old stash of engine parts and found a standard bearing set from Metal Leve. These are probably from the early 90's which is the last time I built an engine. Would these be a better option than the Silverline or Mahle blue box that I have now?

Thanks
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[evanfrucht]

Those are probabaly as good or better than the Silverline but as always measure them of course.
_________________
1967 Bug ( the daily rod )
1964 Fury Wagon ( the pavement shredder )

[55rag]

Thanks for the advice...

Does anyone have thoughts on the main bearing tolerances? Thank you
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[55rag]

Looks like my post didn't come through.

I bought another set of Silverline main bearings to see if I could get a tighter fit but they were actually looser so I'll be using the first set. Would there be any benefit to replacing the #3 bearing with the split steel backed bearing?

Also, I dissected my old motor a little more and had to use a puller on #1 main. When I bought this motor it had already been broken in but the cam went flat after a few miles. The builder took it back and replaced the cam but I'm pretty sure he didn't replace bearings or do anything but clean it up. That's probably where all the journal scouring came from. After that it ran fine until the bearing seized. Can anyone tell by the pictures why?

Thanks,
Jason
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[55rag]

I finally found some time to work on the motor today. I cleaned up the case a bit and wanted to fit the crank with bearings in the case. The crank is real tight and doesn't spin freely and this is just in a case half. The bearings were seated in the case but it looks like #2 bearing has slight shiny marks at the split. See the pic.

Any ideas on how to resolve this? I did check the crank for run out and it is true.

Thanks for the help
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[55rag]

Sunday morning help....Does anyone have a suggestions for things to check on why the crank is tight in the case? Or should i have the machine shop check for line bore? Thank you
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[M. Notary]

[nsracing]

There is a lot of yap here for nothing. Are you guys going to help build this engine?

If you want to see if the crank will spin by hand, just use the #1 and #3 bearings - lay them 3 parts in the case and check. Do not use the split bearing for spinning check - will need to be crushed by the other casehalf to spin the crank properly.

What you should be doing is the put all the bearings on the crank and close the case w/ minimal torque. Make it all even torque setting. Spin the crank then see if it spins freely.

this is a stroker = so you will do several trial-assembly before you glue it together. DO NOT BUILD THIS LIKE YOU DO STOCK - gluing it as you go along.

Fit the parts, torque them minimally and assemble like in the final assembly. You will do this until you have done the endplay, deck height, done the rocker geometry, and cut the proper pushrods, check for piston-to-valve clearances. All the while checking for interferences...rod to case, rod the cam..so on. Use light springs in the heads to check - you have to disassemble the heads anyway.

When everything checks out on the trial assembly, wash and clean everything and re-do the trial assembly. this time use more oil on the parts. You can actually spin this by hand as fast as you can if you like. If you are happy, then re-wash and clean everything and prep for final assembly -w/ the glue.

Most here will build a stroker, one time and glue parts as they go along. That is WRONG! you will end up w/ a seized engine...again. Looks like that first engine was built during a sandstorm - pretty dirty!

Good luck to you man.

[Bad bug]

[55rag]

Thanks for helping me push this along.

M. Notary, the bearings do slide on the crank and I measured them with an old beat up Starrett which may not be the most accurate for sure. I should invest in a new one.

The pic of the bearing out of the seized engine was spun which is the result but not the cause. It looks like that bearing lost oil pressure to me and then spun but I don't know why it would do that after a couple thousand miles.

nsracing, I appreciate the help. I put the crank in like you suggested with #1 and 3 bearings and the crank turned free and easy. I also put in 4 and it still spun free. I'll put in 2 tomorrow and torque the case to see how it goes. Thanks for the advice.

I'm far from starting to glue anything up at this point. I do plan on trial fitting everything a few times and get all the measurements right before I glue it up. Trying my best to avoid another seized up motor.

I did get the cam thrust set today, had to sand down the thrust bearings a bit to get .003 play.

Thanks again,
Jason
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[Pruneman99]

With the small oil galleries on that crank, you probably want to groove the inside of the bearing for more oil flow. You are only getting oil to the bearings for like 20% of crank rotation.

[55rag]

Hey Pruneman, are you talking about grinding out the bearing oil groove to line up with the oil galley in the case?
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[evanfrucht]

[evanfrucht]

[55rag]

I think that's what Pruneman was talking about. i haven't modified the bearings yet but it will be done for sure. Thanks
_________________
55 ragtop bug
67 Ghia vert
85 911
18 GTI
Some beat up British bikes

[Bad bug]

[Pruneman99]