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Need help Diamond piston guys

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Old 06-08-2009, 11:33 PM
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Need help Diamond piston guys
hey guys,

I am currently installing my diamond pistons into my car I was wondering do I have to bore out my rod to get the piston wrist pin to fit? or are they pressed in?


thanks in advance
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Old 06-09-2009, 07:26 AM
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Nope, I used the diamond pins they come with and they fit perfectly.
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Old 06-09-2009, 08:18 AM
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Originally Posted by damien
Nope, I used the diamond pins they come with and they fit perfectly.
did they just slip in? mine are very very hard to go in and wont go in all the way.
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Old 06-09-2009, 08:35 AM
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Pretty much. I lubed mine up nicely and they just kinda went in.
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Old 06-09-2009, 08:41 AM
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you need to have the small end of the rod honed (bring to a machine shop) don't push them in like that since they are out of the tolerance spec
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Old 06-09-2009, 09:51 AM
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Originally Posted by 06blackg85ss
you need to have the small end of the rod honed (bring to a machine shop) don't push them in like that since they are out of the tolerance spec
This man is correct. You need to have .001" of clearance in there. The small end of the rods will need to be honed to .907".
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Old 06-09-2009, 09:54 AM
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thanks guys I will get to the machine shop do you guys know the spec to machine to?
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Old 06-09-2009, 09:55 AM
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Originally Posted by fast98
This man is correct. You need to have .001" of clearance in there. The small end of the rods will need to be honed to .907".
He posted that already?
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Old 06-09-2009, 10:15 AM
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does this need to be done on every install. i just got my pistons and am begining teardown.
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Old 06-09-2009, 10:21 AM
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Mine fit just fine, many others have as well.
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Old 06-09-2009, 10:39 AM
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Originally Posted by JapEatr
does this need to be done on every install. i just got my pistons and am begining teardown.
Yes it should be done on every install.
Originally Posted by damien
Mine fit just fine, many others have as well.
You used your stock wrist pins?
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Old 06-09-2009, 10:48 AM
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Nope, I used the diamond pins.
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Old 06-09-2009, 11:01 AM
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i have diamond pins also

how did you guys gap the piston rings? did you line up the gaps? is filing necessary? did you hone?

a few questions as i am in process
Last edited by JapEatr; 06-09-2009 at 11:01 AM. Reason: Automerged Doublepost
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Old 06-09-2009, 11:04 AM
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I honed my cylinders and had to file all my rings except the oil control ones. Buy a ring filer and use it the right way. Also lined up the gaps the way total seal recommended.
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Old 06-09-2009, 11:12 PM
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Originally Posted by ShortStack
He posted that already?

sorry my fault thanks I sent everything out to the machine shop just waiting on them then I can finally get this thing back together.

thanks for all the help guys
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Old 06-10-2009, 10:31 PM
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are you guys having your engins balanced with these diamond pistons. Thanks I don't have much time on the internet so please don't tell me to do a search.
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Old 06-11-2009, 08:18 AM
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Originally Posted by JAESS
are you guys having your engins balanced with these diamond pistons. Thanks I don't have much time on the internet so please don't tell me to do a search.
I havn't balanced my engine
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Old 06-11-2009, 09:09 AM
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I had everything weighed and all rods were equal and all pistons were so I didn't see a need to balance
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Old 06-11-2009, 08:39 PM
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Thanks guys
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Old 06-11-2009, 08:46 PM
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Inline motors do not need balanced.

You can re-use OEM wrist pins if you want. I've done installs both ways without any issues.

Reason they don't fit is one manufacturer just has a tighter spec tolerance than the other.

You can get Total Seal Gapless rings, but ones shipped with the Diamond pistons by default, are file to fit.
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Old 06-15-2009, 10:29 AM
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Old 09-02-2009, 01:40 AM
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