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07-20-2014, 10:46 AM #1Junior Member
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07-20-2014, 04:29 PM #2Screaming And Flying!
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most all pistons i have bought for rebuilds will tell you in the box what it should bore to, promarine and vertex say .3.530
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07-20-2014, 05:05 PM #3Junior Member
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07-20-2014, 05:22 PM #4
I would call that the advertised size of the piston. If you measure it you will probably see it is actually about .006/7 smaller than 3.530.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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07-20-2014, 05:39 PM #5Screaming And Flying!
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Rock is correct a .030 piston is not 3.530
Last edited by TEXAS20225; 07-20-2014 at 05:42 PM.
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07-21-2014, 05:21 AM #6Junior Member
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So what are you guys machining bore sizes to?
My stock finish bore in my Mercury service manual is 3.501. 0.15 over is 3.516 finish bore. The manual says the tolerance is 0.006" from standard finish bore. My service manual does not mention specs for 0.030" over.
Standard piston measurements are 3.494 +/- 0.001"
0.015 over piston size are 3.509 +/- 0.001"
So from what I can see, specs seem to be 0.007" over piston size? with an additional 0.006" tolerance?
What would you guys think about going to 0.008" over piston size? I feel this would keep me a bit "safer" from pistons seizing in the bores when hey warm up?
Thanks for the input guys! I'm nervous, I only get one shot at this.
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07-21-2014, 09:56 AM #7Junior Member
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So no luck getting in touch with anyone at GLM Marine that was able to help. I did speak to a helpful tech at Mercury tech support. He recommends a bore of 3.531". Stock finish bore was 3.501".
I sent the block off to the machine shop and I should get it back in a couple of days. *fingers crossed*
Also, when I asked the machine shop about the port chamfer, he told me he never chamfers those blocks that he simply de-burs them. I'm under the impression that de-burring is actually a light chamfer no? How can I make sure the chamfer is "good enough" ?
Thanks!
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07-21-2014, 10:25 AM #8
You need to know if the pistons are cast or forged. .006 is fine for cast but forged should be .008. Deburring ports will be fine. All you are trying to do is make sure the edge of a port don't catch a ring. Good luck.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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07-21-2014, 10:32 AM #9Junior Member
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07-22-2014, 09:18 AM #10Junior Member
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well. $hit... When it rains it pours...
The machine shop just called me and their boring machine is not capable of going deep enough into the block... The crankcase plate is in the way... anyone know of a machine shop near Ottawa Ontario (Canada) or as far out as Montreal that can do this? I need to bore the holes 0.030" over.
Thanks!
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07-22-2014, 07:33 PM #11Screaming And Flying!
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send it to Rock he does that stuff and he is a good mechanic to boot just ship it at nite across the boarder then you wont get robbed by the establishment