I wouldn't like those numbers and I would have the journals plastigauged
before installing it. If the machine shop is that sloppy on end play,
how good are they with bearing clearances?

When I hear crap like that coming from a so called professional shop, I
tend to find a new shop sooner than later.

I am going to refresh a 258 I have in my garage maybe with my 4.0 block
and I certainly would 'not' go to all that work and expense to put in
parts that are already out of or at the limit of their tolerances.

Not a hope.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Brent wrote:
>
> Hello,
>
> I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
> crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
> inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
> me that the end play is perfect and less could cause friction
> problems, i.e burn out. To me, if it is engineered for .002-.0025 that
> should be the optimal range. I'm at the high end for wear according to
> the manual, and I see this giving me less engine life.
>
> Also, my side cleance is 0.022 in. and .019 in. for two of the
> connecting rods. The range is 0.01-0.019 inches. My machinsts told me
> the .022 will not be a problem.
>
> I'm concerned with my machine shops responce. Yes it will run fine,
> but how about 50K mi from now? Is my machinist BS'ing me becaused they
> screwed up or are thses tolerances acceptable for a rebuild?
>
> Thanks

 

I wouldn't like those numbers and I would have the journals plastigauged
before installing it. If the machine shop is that sloppy on end play,
how good are they with bearing clearances?

When I hear crap like that coming from a so called professional shop, I
tend to find a new shop sooner than later.

I am going to refresh a 258 I have in my garage maybe with my 4.0 block
and I certainly would 'not' go to all that work and expense to put in
parts that are already out of or at the limit of their tolerances.

Not a hope.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Brent wrote:
>
> Hello,
>
> I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
> crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
> inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
> me that the end play is perfect and less could cause friction
> problems, i.e burn out. To me, if it is engineered for .002-.0025 that
> should be the optimal range. I'm at the high end for wear according to
> the manual, and I see this giving me less engine life.
>
> Also, my side cleance is 0.022 in. and .019 in. for two of the
> connecting rods. The range is 0.01-0.019 inches. My machinsts told me
> the .022 will not be a problem.
>
> I'm concerned with my machine shops responce. Yes it will run fine,
> but how about 50K mi from now? Is my machinist BS'ing me becaused they
> screwed up or are thses tolerances acceptable for a rebuild?
>
> Thanks

 

I wouldn't like those numbers and I would have the journals plastigauged
before installing it. If the machine shop is that sloppy on end play,
how good are they with bearing clearances?

When I hear crap like that coming from a so called professional shop, I
tend to find a new shop sooner than later.

I am going to refresh a 258 I have in my garage maybe with my 4.0 block
and I certainly would 'not' go to all that work and expense to put in
parts that are already out of or at the limit of their tolerances.

Not a hope.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Brent wrote:
>
> Hello,
>
> I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
> crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
> inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
> me that the end play is perfect and less could cause friction
> problems, i.e burn out. To me, if it is engineered for .002-.0025 that
> should be the optimal range. I'm at the high end for wear according to
> the manual, and I see this giving me less engine life.
>
> Also, my side cleance is 0.022 in. and .019 in. for two of the
> connecting rods. The range is 0.01-0.019 inches. My machinsts told me
> the .022 will not be a problem.
>
> I'm concerned with my machine shops responce. Yes it will run fine,
> but how about 50K mi from now? Is my machinist BS'ing me becaused they
> screwed up or are thses tolerances acceptable for a rebuild?
>
> Thanks

 

In blueprinting a Chevy they're not bothered by the rod end play,
they do prefer at least .0012" at the wrist pin:
http://hp-car.com/engine/building/build2.pdf I wouldn't worry about it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Brent wrote:
>
> Hello,
>
> I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
> crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
> inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
> me that the end play is perfect and less could cause friction
> problems, i.e burn out. To me, if it is engineered for .002-.0025 that
> should be the optimal range. I'm at the high end for wear according to
> the manual, and I see this giving me less engine life.
>
> Also, my side cleance is 0.022 in. and .019 in. for two of the
> connecting rods. The range is 0.01-0.019 inches. My machinsts told me
> the .022 will not be a problem.
>
> I'm concerned with my machine shops responce. Yes it will run fine,
> but how about 50K mi from now? Is my machinist BS'ing me becaused they
> screwed up or are thses tolerances acceptable for a rebuild?
>
> Thanks

 

In blueprinting a Chevy they're not bothered by the rod end play,
they do prefer at least .0012" at the wrist pin:
http://hp-car.com/engine/building/build2.pdf I wouldn't worry about it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Brent wrote:
>
> Hello,
>
> I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
> crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
> inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
> me that the end play is perfect and less could cause friction
> problems, i.e burn out. To me, if it is engineered for .002-.0025 that
> should be the optimal range. I'm at the high end for wear according to
> the manual, and I see this giving me less engine life.
>
> Also, my side cleance is 0.022 in. and .019 in. for two of the
> connecting rods. The range is 0.01-0.019 inches. My machinsts told me
> the .022 will not be a problem.
>
> I'm concerned with my machine shops responce. Yes it will run fine,
> but how about 50K mi from now? Is my machinist BS'ing me becaused they
> screwed up or are thses tolerances acceptable for a rebuild?
>
> Thanks

 

In blueprinting a Chevy they're not bothered by the rod end play,
they do prefer at least .0012" at the wrist pin:
http://hp-car.com/engine/building/build2.pdf I wouldn't worry about it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Brent wrote:
>
> Hello,
>
> I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
> crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
> inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
> me that the end play is perfect and less could cause friction
> problems, i.e burn out. To me, if it is engineered for .002-.0025 that
> should be the optimal range. I'm at the high end for wear according to
> the manual, and I see this giving me less engine life.
>
> Also, my side cleance is 0.022 in. and .019 in. for two of the
> connecting rods. The range is 0.01-0.019 inches. My machinsts told me
> the .022 will not be a problem.
>
> I'm concerned with my machine shops responce. Yes it will run fine,
> but how about 50K mi from now? Is my machinist BS'ing me becaused they
> screwed up or are thses tolerances acceptable for a rebuild?
>
> Thanks

 

In blueprinting a Chevy they're not bothered by the rod end play,
they do prefer at least .0012" at the wrist pin:
http://hp-car.com/engine/building/build2.pdf I wouldn't worry about it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Brent wrote:
>
> Hello,
>
> I am stroking my 91 cherokee 4.0 with a 258 crank and 258 rods. My
> crankshaft end play is at 0.0055 inches. The range is 0.0015-0.0065
> inches . The ideal range is ~ 0.002-0.0025 inches. My machinist tells
> me that the end play is perfect and less could cause friction
> problems, i.e burn out. To me, if it is engineered for .002-.0025 that
> should be the optimal range. I'm at the high end for wear according to
> the manual, and I see this giving me less engine life.
>
> Also, my side cleance is 0.022 in. and .019 in. for two of the
> connecting rods. The range is 0.01-0.019 inches. My machinsts told me
> the .022 will not be a problem.
>
> I'm concerned with my machine shops responce. Yes it will run fine,
> but how about 50K mi from now? Is my machinist BS'ing me becaused they
> screwed up or are thses tolerances acceptable for a rebuild?
>
> Thanks