Piston install questions
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Cargo Master
Joined: May 2011
Posts: 2,387
Likes: 138
From: Northern California
Piston install questions
I got 4 pistons ringed and installed today... Only broke a single ring... Kudos to Summit for comp'ing me a replacement; so far, besides machining, I have gotten everything from them for this project.
So I was looking at these and it seems the angle of the valve reliefs is slanted. I compared to the head and the orientation seems correct. I also have the notches forward. Anyways I was just wondering if this all seems right.
So I was looking at these and it seems the angle of the valve reliefs is slanted. I compared to the head and the orientation seems correct. I also have the notches forward. Anyways I was just wondering if this all seems right.
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 35
From: British Columbia
I think that the reason the valve reliefs look slanted is because there are two large and two small and they are diagonally opposite. If they were all the same size, then the slant would disappear.
The notches should face towards the front of the engine. What's the deck clearance? You can check with feeler gauges.
The notches should face towards the front of the engine. What's the deck clearance? You can check with feeler gauges.
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Cargo Master
Joined: May 2011
Posts: 2,387
Likes: 138
From: Northern California
Are these the numbers you are referring to?
Cause I meticulously looked on 3 & 4 and there is nothing stamped on either side.
I did request the machinist dummy proof this by writing the cylinder number on each piston.
So as long as these are cylinders 1 - 4 I am reasonably confident I have everything as it should be.
Cause I meticulously looked on 3 & 4 and there is nothing stamped on either side.
I did request the machinist dummy proof this by writing the cylinder number on each piston.
So as long as these are cylinders 1 - 4 I am reasonably confident I have everything as it should be.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Yea those are the numbers. If you'll notice, the bearing shells are offset slightly to one side in the rod, so that the bearing is spaced away from the journal fillet (the curve in the transition from the journal to the side of the counterweight) The bearings should be spaced towards each other, or towards the center of the journal when they're paired together.
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Cargo Master
Joined: May 2011
Posts: 2,387
Likes: 138
From: Northern California
So the idea is to keep the caps from rubbing on the crank?
I am confident this is correct but cant be too careful.
I am confident this is correct but cant be too careful.
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Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
No, this is to keep the bearing shell spaced away from the curved transition from the journal to the counterweight. The only thing keeping the side of the rods away from each other and the counterweight is the film of oil coating them.
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Cargo Master
Joined: May 2011
Posts: 2,387
Likes: 138
From: Northern California
In the correct order... Yes. Oil, iron, & moly. At least i think thats the order of the compression ring. It was labelled first second & third.
I will position the gaps before Ii stick it in the cylinder.
I will position the gaps before Ii stick it in the cylinder.