Cylinder rounding tool

**Krazymaan** · 07-18-2017, 08:03 PM

What does the cylinder rounding tool look like? Are they home made shop pieces or are they made at a factory?

**patchesII** · 07-18-2017, 08:17 PM

Anybody could build one if they had a mill and lathe. Lot easier to call Michael Clemmons at Outback Outboards and buy one. They're not that much

**Dave S** · 07-18-2017, 08:23 PM

I cut a old piston in halve and use a hammer pry weadge and Wack it.....Heat don,t matter. but helps

**Krazymaan** · 07-18-2017, 08:54 PM

Couldn't you just use a 3.5" Quality Exhaust pipe expander and not crank on it so hard?
What part will go out of round the most? I'm guessing the top half being it doesn't have any backing like the bottom half.

Just for a quick example. This is only $20

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**patchesII** · 07-20-2017, 05:43 AM

You don't quite understand the concept. The part you posted will apply pressure evenly to the entire circumference. The idea is to straighten out of round bores. To do so you have to apply pressure where you want it, not the whole thing. The tool is available from Outback Outboards.

**Krazymaan** · 07-20-2017, 07:39 AM

Thanks, I'll give them a call.

**SHADOW** · 07-20-2017, 09:11 AM

[QUOTE=patchesII;2972386]Anybody could build one if they had a mill and lathe. Lot easier to call Michael Clemmons at Outback Outboards and buy one. They're not that much[/QUOTE

Do you have a number for Mike? Thanks.

**Jay Smith** · 07-20-2017, 03:49 PM

I've built them for years .
First built by Jim Ruck then I copied them after Jim stopped making them I've sold many of them for straightening all 3.500" bored nickle or steel .
Jayb
832 597 3603

**eli** · 07-20-2017, 04:09 PM

i watched jim ruck
do mine years ago

**JCSmile** · 07-20-2017, 05:20 PM

How out of round do these fix? Had a 2.0 for years that has had terrible leak down numbers even with new rings and suspect the bores are out of round.

**stoker2001** · 07-20-2017, 05:42 PM

Originally Posted by Dave S

I cut a old piston in halve and use a hammer pry weadge and Wack it.....Heat don,t matter. but helps

need vid of this..wacking the whacker..LOL
seriously

**SHADOW** · 07-20-2017, 06:09 PM

Originally Posted by Jay Smith

I've built them for years .
First built by Jim Ruck then I copied them after Jim stopped making them I've sold many of them for straightening all 3.500" bored nickle or steel .
Jayb
832 597 3603

Thanks Jay, I'll give you a call.

**Krazymaan** · 07-20-2017, 07:08 PM

Anyone care to share their photos of this contraption.

**perfmarine1** · 07-20-2017, 07:22 PM

On the crossflow motors we make little wedges to push cylinder back straight, then drill 2 holes in the wedge to help keep it cool, works like a charm. Cyl are thin on them so all of them warp up top.