kermit_rr

Very

Full Member

• Feb 24, 2024

• #21

Don't touch it with sand paper.
I'm more concerned with the liner, it doesn't look level with the top of the block.
How does it compare with the others?

 

Henry_b

Think outside, no box required.

• Feb 24, 2024

• #22

That bore doesn't look good in all honesty looks like slight corrosion damage..
Also as said above the liner doesn't look level with the deck of the block.

 

kermit_rr

Very

Full Member

• Feb 24, 2024

• #23

Henry_b said:

That bore doesn't look good in all honesty looks like slight corrosion damage..
Also as said above the liner doesn't look level with the deck of the block.

Click to expand...

Piston also looks way too clean, unless it's been done since the head came off

 

Datatek

Well-Known Member

• Feb 24, 2024

• #24

roule said:

I'm a little worried with this cylinder: I have a vertical scratch, not a groove but rather a thickness; a piece of my camshaft that came off and melted?? should I sand it with 800 sandpaper?

Click to expand...

I would say that liner is knackered.

 

kermit_rr

Very

Full Member

• Feb 24, 2024

• #25

Datatek said:

I would say that liner is knackered.

Click to expand...

It's certainly not 'new'

 

roule

Active Member

• Feb 24, 2024

• #26

I cleaned the head pistons. All the cylinders are like that with no marks on the top.

 

roule

Active Member

• Feb 25, 2024

• #27

I notice a ridge (i can feel it easily with my finger) on all the rigth bank cylinders (first picture), and none on the left bank ...i cant explain this difference...the 8 cylinders where rebuild 10 years ago...

 

Datatek

Well-Known Member

• Feb 25, 2024

• #28

roule said:

I notice a ridge (i can feel it easily with my finger) on all the rigth bank cylinders (first picture), and none on the left bank ...i cant explain this difference...the 8 cylinders where rebuild 10 years ago...View attachment 311261View attachment 311262

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The liners have dropped, a common problem with the V8. Not useable in the current condition, complete overhaul required preferably with top hat liners.

 

roule

Active Member

• Feb 25, 2024

• #29

Are you sure ?? My compressions were good before stripping.

 

Datatek

Well-Known Member

• Feb 25, 2024

• #30

roule said:

Are you sure ?? My compressions were good before stripping.

Click to expand...

I'm no expert on the V8, but from what I have read over the years on LZ, if the liners have dropped, it will constantly blow head gaskets and the liners may actually move up and down. As far as the liner with the score is concerned, if the score is as deep as it looks, to me that would at least need a re-bore or a replacement liner.

 

roule

Active Member

• Feb 25, 2024

• #31

I just checked it again : the circle at the top of the cylinder is thicker than the rest, probably the fact that the piston does not work on the upper part...

 

Datatek

Well-Known Member

• Feb 25, 2024

• #32

roule said:

I just checked it again : the circle at the top of the cylinder is thicker than the rest, probably the fact that the piston does not work on the upper part...

Click to expand...

That's the distance down to the first piston ring.

 

roule

Active Member

• Feb 25, 2024

• #33

c'est ça

 

kermit_rr

Very

Full Member

• Feb 25, 2024

• #34

Datatek said:

I'm no expert on the V8, but from what I have read over the years on LZ, if the liners have dropped, it will constantly blow head gaskets and the liners may actually move up and down. As far as the liner with the score is concerned, if the score is as deep as it looks, to me that would at least need a re-bore or a replacement liner.

Click to expand...

The liners certainly moved on my old engine, you could hear them when it got hot enough. It didn't blow the gasket but it didn't need to as the oem liners don't touch the gasket (which is why top hats work)