The 258 bore is smaller than the 4.0 combustion chamber.
Plan is to taper the bore above the piston top ring @ TDC
out to meet the 4.0 diameter.
Without pulling the engine - is there a tapering tool
that could be set to perform the job correctly -
rather not go after this with a die grinder & eyeball.
TOOL_TIME - tapering the 258
- Alex22
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- Joined: March 7th, 2008, 7:37 pm
Re: TOOL_TIME - tapering the 258
I haven't seen any special tool for that. The few times I have done it was on a bare block (non-jeep) on engine stand. I just used dyekem on the deck and bore, scribed the head gasket and measured the depth to the first ring and started at it. With enough tape and rags and a vacuum you should be able to do this with with a die grinder and a carbide burr and finish with sand paper.
~Alex
~Alex
The enemy of good thing is wanting something better.
- Alex22
- Consistent
- Posts: 273
- Joined: March 7th, 2008, 7:37 pm
Re: TOOL_TIME - tapering the 258
You should also put a little grease in the space between the piston and the cylinder wall when you grind it.
~Alex
~Alex
The enemy of good thing is wanting something better.
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