Top-End Reassembly

The head is out for valve guide service, and I'm working out a reassembly plan.

At this point I plan to reuse the 6K mile pistons and rings in the untouched (un-honed) cylinder bores.
The rings were carefully removed, and replaced after the pistons were cleaned, and after the intake valve pockets were modified for clearance.

So I'm essentially back to square one considering gap orientation, whether it makes any difference when reusing the rings.

Considering the following sketched options (recommendations?) before moving forward:




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There are lot's of different opinions on this, my preference would be as per the pink sheet in the picture which looks like the manufacturer's install instructions

It's good engineering practice to stagger the ring gaps on assembly but it doesn't really matter what degree of separation you use as they do rotate and constantly line up and pass each other in use.
I've always set the gaps on the 3 piece oil ring assembly at around 120 degrees apart and the two compression ring gaps at 180 to each other very much like Wiseco/MTC suggest..
 

Wookie58 wrote:

There are lot's of different opinions on this, my preference would be as per the pink sheet in the picture which looks like the manufacturer's install instructions

IMO, the Wiseco/MTC illustration is confusing, regardless the time of day I look at it...mid-morning being the worst.
It appears to describe the right (or left?) hand side of a V-8 motor, like the ​​​​​fiasco one in my 07 GM truck.

😵‍💫
 

I always followed the Kawasaki recommendation, It also depends on what type of ring compressor you are using. You will have a more harmonious outcome if the ring end gaps are captured by the compressor.
Mike

daveo wrote:

Wookie58 wrote:

There are lot's of different opinions on this, my preference would be as per the pink sheet in the picture which looks like the manufacturer's install instructions

IMO, the Wiseco/MTC illustration is confusing, regardless the time of day I look at it...mid-morning being the worst.
It appears to describe the right (or left?) hand side of a V-8 motor, like the ​​​​​fiasco one in my 07 GM truck.

😵‍💫

 

Wookie58 wrote:

daveo wrote:

Wookie58 wrote:

There are lot's of different opinions on this, my preference would be as per the pink sheet in the picture which looks like the manufacturer's install instructions

IMO, the Wiseco/MTC illustration is confusing, regardless the time of day I look at it...mid-morning being the worst.
It appears to describe the right (or left?) hand side of a V-8 motor, like the ​​​​​fiasco one in my 07 GM truck.

😵‍💫



 

Though late, it's still morning here...

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Google AI:


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I am confused, that is pretty much what we have been saying with the exception of the wrist pin comment which contradicts MTC instructions !!! Where is it from ? I don’t see the correlation between ring gaps and wrist pin. I guess when you have contradictory guidance you need to go with your gut

I always use MTC's ring install instructions, never had a issue. The majority of my big bore kits have been MTC, a couple of Wiseco's and JE's. Since my first bore kit was a MTC I always revert back to those instructions even if re-ringing stock Kawi pistons.

www.mtceng.com/wp-content/uploads/2020/0...kit_installation.pdf

Injected wrote:

I always use MTC's ring install instructions, never had a issue. The majority of my big bore kits have been MTC, a couple of Wiseco's and JE's. Since my first bore kit was a MTC I always revert back to those instructions even if re-ringing stock Kawi pistons.

www.mtceng.com/wp-content/uploads/2020/0...kit_installation.pdf

I would second this - I have done over a dozen kzs the same.

Wookie58 wrote:

 the wrist pin comment  Where is it from ? 

 It's AI crap....

Is the drawing adaptation below  better suited for our DOHC motorcycle engine applications?