Bearing Issue

My mains are not looking to good but maybe not bad enough for a complete teardown.
The photos are from King Alecular where the top coating is wiped in spots but it doesnt look deep. I have a hard time judging these because the factory top surface is somewhat dull.
For what it matters the motor is a 547 steel crank, D9 block, Kaase pump. It has been to 6800 rpm a few times. Oil pressure has been good except for shut down at the end of the track.
The rod bearing/cap is next to it for photo comparison it is next to perfect. Main clearances are 2.5 thousands.
I'm thinking about putting it back together as is or replacing the bearings with Clevite 77's or removing the motor and going thru a line hone.
Engine has 40 passes at the track with 200 street miles.
Opinions on these bearings?
Thanks
Dave
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I would roll in a new set of .001 oversize main brgs and run it.

dkp

bosshoss wrote:I would roll in a new set of .001 oversize main brgs and run it.

dkp

what do you mean by "roll in "

I mean install the bearings without removing the crank.

dkp

bosshoss wrote:I would roll in a new set of .001 oversize main brgs and run it.

dkp

x2,no need for a complete teardown imo

i'd like the mains @ .003.JMO

cool40 wrote:i'd like the mains @ .003.JMO

.0034-.0036 as much as ur turning it. Also looks to have a spec or two of dirt in it too.

Thanks for the opinions I'll try to find a set of tri-metal plus 1's. The grunge in the bearings dont look good either a spec or two is being kind.

Randy Malik if you see this let me know if you have a set of bearings and I'll come over and buy them, I work in Fraser so you are close to me.

Dave

IDT-572 wrote:

..... looks to have a spec or two of dirt in it too

I too concur.
Dave.

Dave De wrote:Thanks for the opinions I'll try to find a set of tri-metal plus 1's. The grunge in the bearings dont look good either a spec or two is being kind.

Randy Malik if you see this let me know if you have a set of bearings and I'll come over and buy them, I work in Fraser so you are close to me.

Dave

Most plus .001" bearings are labeled as X1 or 1X or extra clearance.

rmcomprandy wrote:

Dave De wrote:Thanks for the opinions I'll try to find a set of tri-metal plus 1's. The grunge in the bearings dont look good either a spec or two is being kind.

Randy Malik if you see this let me know if you have a set of bearings and I'll come over and buy them, I work in Fraser so you are close to me.

Dave

Most plus .001" bearings are labeled as X1 or 1X or extra clearance.

Correct...most do. King calls them STD X

Dave did u have a problem to tear
down or r you just bored and inspecting
Dale

Dale,
Good question there. The reason for dropping the pan was to adjust the pickup on the oil pump. The pickup is bent backwards towards the rear of the pan by about 3/8 of an inch. This may be part of the reason that the oil pressure is dropping during shutdown. Since I was in there I thought I should take a peak at the bearings.
Shutdown at Ubly is tight and I dont have the problem nearly as much with a longer track.
Let's get together sometime this spring. Maybe we can meet at the track.
Dave

Dave De wrote:Dale,
Good question there. The reason for dropping the pan was to adjust the pickup on the oil pump. The pickup is bent backwards towards the rear of the pan by about 3/8 of an inch. This may be part of the reason that the oil pressure is dropping during shutdown. Since I was in there I thought I should take a peak at the bearings.
Shutdown at Ubly is tight and I dont have the problem nearly as much with a longer track.
Let's get together sometime this spring. Maybe we can meet at the track.
Dave

put one of those accumulators like Dan had for sale and the oil drop at shutdown will be taken out of the picture. Its also good at preventing dry start ups.

[

put one of those accumulators like Dan had for sale and the oil drop at shutdown will be taken out of the picture. Its also good at preventing dry start ups.[/quote]

X2

How is the chamfer on the oil holes on the crank? Are they nice and swept back? Maybe the oil hole is the culprit?

The chamfer is good and the transition is generous as well. I agree the accumulator is a great idea and will look into it.
Running out of oil during shutdown is common? Anyone else have that problem? Maybe pan related with a Moroso 20614?

Thanks for the recommendations

Dave

Dave De wrote:The chamfer is good and the transition is generous as well. I agree the accumulator is a great idea and will look into it.
Running out of oil during shutdown is common? Anyone else have that problem? Maybe pan related with a Moroso 20614?

Thanks for the recommendations

Dave

my car does it,always has with a milodon chassis pan.my bearings looked a lot like yours last time it was down but it had hundreds of passes on it.

i would lose oil pressure as well with the stock van or truck rear sump pan when i put the ford rear sump pan that Lem sales the problem went away but im going alot slower 126 mph is my best
Dave hope to be out in may having a nitemare with my converter sent it to PTC and it came back without lockup had to send it back cant seem to get it right but PTC is a good company it will work out ive had this trans out 5 times in 2 weeks