bore= 3.1496 to 3.1499 per manual
Ron
Thomas Walter wrote:
> OK you trivia buffs, what is the correct size
> of the "G" 1500 engine bore size.
>
> Charlie Hubbard stopped by yesterday with parts
> of his 1500 engine in the back of his Explorer.
>
> We did the visual inspection, and everything looked
> great! Only one I kept hanging up on was the pistons
> were standard. But pistons were at 3.140" Bore was
> at a few thousands bigger. Thankfully no taper, no
> oval shape, to the bores. Charlie lucked out!
>
> Still I'd like to confirm the bore size, as my only
> notes have 3.150" inch... so you can understand why
> I was scratching my head trying to figure out if the
> pistons were oversize or not. After a little carbon
> cleaner on the piston tops we could find "STD" marked
> on them, confirming standard sizing.
>
> On the THRUST SURFACES (middle cap), there was a good
> question. Do you have to "file down the surface to fit".
> Typically those thrust surfaces are too keep the crank
> from sliding back and forth. You want about 0.001 to 0.006"
> end play on the cranksahft, limit around 0.010". For the
> life of me, I never remember needing to "sand down" a
> thrust surface to fit. Once again, I am ONLY talking about
> the Datsun Motors. Just wondering if anyone ever ran into
> problems with oversize thrust surfaces.
>
> Little Humor: my straigh edge showed about 0.003" warp on
> the cast iron head. Flip it over, and it didn't! It was a
> uniform 1.003" wide x 1/8" thick. The entire straight edge
> was warped 0.001 5". So after checking the warp with the
> straight edge checked both ways.. total warp at the head
> was only 0.001 5".
>
> Cheers,
>
> Tom Walter 67 2000
> Austin, TX 68 2000
>
> P.S. Long three day weekend... I am planning to get into the
> garage to crank out some of those smog plugs this weekend.
> Still behind, but hopefully will get some made this weekend!
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