Engine builders

Engine builders

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BlueWedgy

Original Poster:

397 posts

112 months

Tuesday 8th March 2022
quotequote all
So onto my next bit of winter tinkering.

It is my intention to replace the main and big-end bearings (engine in the car).
I intend to roll out top half of the mains.
Both the mains and big-end bearings are +010, so the crank must have had some work at some point.

So my question is #3 main is a wrap round type. Having cracked the cap off, the bearing appears to be very and I mean very tight to the cap, is this to be expected?

When I removed the sump, the pick-up strainer had silicon attached to it, silicon lumps in the small amount of sludge, and a small washer, not as many surprises, as I have had before in the past.
The silicon lumps are a good reason not to use it neat on a pan not really designed to do so unlike modern cars. Surefire likely point of oil starvation blocking the strainer

Edited by BlueWedgy on Wednesday 9th March 07:21

Boosted LS1

21,198 posts

270 months

Tuesday 8th March 2022
quotequote all
That sounds like a thrust bearing and yes, they can be a very snug fit in the cap.

BlueWedgy

Original Poster:

397 posts

112 months

Tuesday 8th March 2022
quotequote all
Arh yes they are thrust bearings.
Thanks for letting me know that they will be tight.

TwinKam

3,203 posts

105 months

Tuesday 8th March 2022
quotequote all
I'd be worried if it wasn't tight!
If you ever encounter a 'hammered' shell, you don't have to try to remove them, they just fall out!

Classic Chim

12,424 posts

159 months

Tuesday 8th March 2022
quotequote all
TwinKam said:
I'd be worried if it wasn't tight!
If you ever encounter a 'hammered' shell, you don't have to try to remove them, they just fall out!
Is that crank movement fore and aft that thins them out til they fall out.
Kin eck.
Interesting stuff thumbup

SLB

261 posts

251 months

Thursday 10th March 2022
quotequote all
I replaced my main and big end bearing shells the same way. I had to carefully use long fine screwdriver to tap round the tops but it all went fine and the engine sounds better for it on start up. On my old SEAC the strainer had fallen off the pipe completely when I took the sump off that.

TwinKam

3,203 posts

105 months

Friday 11th March 2022
quotequote all
Top tip for 'next time' wink ...insert the aluminium part of a pop rivet into the oil feed hole of a main journal, so that its head protrudes, it will sweep the top shell out as you rotate the crank by hand. Probably won't work on the one with integral thrusts, but they have plenty of edge to tap at anyway.

BlueWedgy

Original Poster:

397 posts

112 months

Sunday 13th March 2022
quotequote all
Well, that's the mains and rear seal done, onto the big-ends next.

Boosted LS1

21,198 posts

270 months

Sunday 13th March 2022
quotequote all
Make sure to have sealant under and on the side of the rear of number 5 main bearing cap in the area after the cruciform seals.

BlueWedgy

Original Poster:

397 posts

112 months

Sunday 13th March 2022
quotequote all
Top tip - Yep done that ta.