Metric or standard?

[BigGun J]

I have a 6.2 motor. The bolts I have removed have been metric. I need bell housing, stater and some other misc bolts. I do not have any metic bolts. I went and bought a metric tap & die set to determine what sizes I needed but my standard dies seem to fit the threads better? I found that a 3/8 course bolt fits the bell housing and starter? Are the bolts all metric or mixed?

Thanks, Jim

[DmaxMaverick]

It depends on the year. Later model bell housing bolts are metric (I don't recall exactly, but 1988+ sounds about right).

[AKMark]

The 1983 6.2L motor and 1991 6.2L motor I had were the same, all metric. With the exception of the bellhousing bolts.

[Robyn]

The 6.2 has US standard threads on the bell housing and the starter all the rest are metric.

Some early 6.5 engines have Standard bell housing bolts too.

I dont really understand why when they decided to go metric that they did not just do it all.

The starter and bell housing are 3/8 NC.
The starter bolts are a special knurled shank bolt though.
The Bell housing is just grade 5 or 8 depending on what you feel like buying

Best

Robyn

[JetBoater]

I got to know my metric 15mm and 18mm sockets and wrenches really well after tearing a few motors down. I agree the mix of imperial and metric bolts on the 6.2 / 6.5 diesel is strange.

I suggest buying new starter and bell housing bolts from your local dealer. The starter bolts take a lot of abuse, will stretch and loose strength.... especially if we are talking about hardware from 1992 and earlier.

;)

[76m880]

I got to know my metric 15mm and 18mm sockets and wrenches really well after tearing a few motors down. I agree the mix of imperial and metric bolts on the 6.2 / 6.5 diesel is strange.

I suggest buying new starter and bell housing bolts from your local dealer. The starter bolts take a lot of abuse, will stretch and loose strength.... especially if we are talking about hardware from 1992 and earlier.

;)

i used some grade 8 1 1/2 inch bolts (i think thats how long i will look tonight to verify) for the bell housing

and for the starter the dealer couldnt even order any for me so i got some from a hardware store for now

i know i got used to using the 10 mm and 15 and the 18 mm alot

[ronniejoe]

My 95 original block had 3/8-16 threads in the bell housing flange. The later blocks have 10mm-.5mm threads in the bell housing flange.

[trbankii]

I agree the mix of imperial and metric bolts on the 6.2 / 6.5 diesel is strange.

While replacing my clutch - pulling the t-case, transmission, crossmember, and all sorts of other stuff - I found I needed my standard and metric sets both at hand. No rhyme nor reason as to which set I'd have to reach for it seemed.

[AKMark]

The 6.2 has US standard threads on the bell housing and the starter all the rest are metric.

Some early 6.5 engines have Standard bell housing bolts too.

I dont really understand why when they decided to go metric that they did not just do it all.

The starter and bell housing are 3/8 NC.
The starter bolts are a special knurled shank bolt though.
The Bell housing is just grade 5 or 8 depending on what you feel like buying

Best

Robyn

Actually all my personal and family (father's) 6.2's (now six in total) had metric starter bolts. I know because we tried to use 3/8's in the one I learned to drive on the farm only to have the bolts shear off during install. We got them out, and took the one old bolt that was still good (we bought the truck new and had not changed the stater for the first ten years of it's life) to Napa and they put it in their bolt sizing device and it matched a metric set. The two 6.2's I played with a lot in the last several years both took a metric bolt. The size I used in both my 82 and 91 6.2's was M10 X 1.5 X 9.8. Fit like a champ, and even without the bracket to support them, never broke off or gave me any problems.

[BigGun J]

From the 6.2/6.5 troubleshooting guide I ordered the starter bolts, brackets and also added the heat shield from my local dealer (thanks for listing the part numbers in the book!) he said they were discontinued until I gave him the numbers. I bought the 3/8 NC from local hardware. My chevy buddy promised the bell housing bolts would be standard. He would not commit to no others though.

Hopefully soon I will have a 1985 Toyota FJ60 powered by a humvee takeout 6.2 mated to a 700R4 (thanks Robin for your 700R4 rebuild sticky in the drive train section) Getting closer every day!!

Jim

93 6.5 turbo extracab 4L80E (my first auto) 2wd.
85 Toyota FJ60 soon to be 6.2