mounting bell housing to trans & tranfers case. HELP!!

[Dwave]

Does anyone know what size bolts to use to mount the bell housing to the transmission and the transmission to the transfers case?
Also should I be using nuts and lock washers anywhere? I have threaded holes but Im not sure if they should be just bolts or have nuts and lock washers on them.

Should I use a gasket spray on the paper gasket betw the trans and bell housing? if so do I spray both sides or just one?

Is there supposed to be a gasket betw the trans and transfer case? or do they just mount together as is?

Sorry for all the questions, just want to make sure its done right.

Dave

[Herb Tate]

Here is a drawing done by Dr. Dave here on the G.

I also sent you a PM on the bolt list. It si very helpfull.

[run forrest run]

Thats what I am talking about. Is this place that Ron has made, a great resource or what? You could search for years and never find this kind of information at your fingertips.

Thank you Ron, and thank you to all the hard core G503ers who check in every day. I think I will send him a check and I hope you will do the same.

[iowa]

hi herb
the only thing i left off
was that the bolts at 2 and 10 o'clock
are dowel bolts.
on several reliable sources,
i was told that
it doesn't really matter
if regular bolts are used
do you agree?
dave

[Herb Tate]

hi herb
the only thing i left off
was that the bolts at 2 and 10 o'clock
are dowel bolts.
on several reliable sources,
i was told that
it doesn't really matter
if regular bolts are used
do you agree?
dave

I agree. I don't see any problem using regular bolts there.

[raingrass]

hi herb
the only thing i left off
was that the bolts at 2 and 10 o'clock
are dowel bolts.
on several reliable sources,
i was told that
it doesn't really matter
if regular bolts are used
do you agree?
dave

I agree with you.

[Chuck Lutz]

Hmm....just checking on the post re: "dowel" bolts at 10:00 o'clock and at 2:00 o'clock. According to the diagram posted those would be two of the four 1 1/8" ones....

Looking at the SNL:

BOLT, hex-hd, S, 3/8-24NF x 2 1/8 (dowel).......................2

SCREW, cap, hex-hd, S, cd or zn-pltd, 3/8-24NF x 1 1/8.....4
SCREW, cap, hex-hd, S, cd or zn-pltd, 3/8-24NF x 1 5/8.....2


So using the diagram, the two long bolts at 9:00 o'clock and 4:00 o'clock would seem to be the two with the "dowel" designation, or am I missing something here?

[iowa]

oh, i think your right!!
it's been awhile
since i did my gpw
and my slat will be coming up soon
dave

[Rml1708]

I am just about ready to bolt my engine to bell housing and am researching this very same thing. What is the difference between a regular bolt and the dowel bolt? There were regular bolts in there when I took them apart.

Robert

[Rml1708]

I am just about ready to bolt my engine to bell housing and am researching this very same thing. What is the difference between a regular bolt and the dowel bolt? There were regular bolts in there when I took them apart.

Robert

[John 63]

The dowel bolts are there to align the bell housing with the engine. This is so that the crankshaft centerline and the transmission input shaft centerline are aligned with each other.

If the crankshaft and trans input shaft are misaligned it may lead to clutch and/or transmission problems.

I don't have the dowel bolts on my GPW, and I think many of us are missing them with no ill effects. They are there for a reason though and I would rather have them than not.

[Herb Tate]

Anyone have a picture f a dowel bolt? Is is the bolt that is only threaded on the end. Sorry for the bad question. To me a bolt is a bolt.

[Sean Collins]

Dowel bolt on the left (click to enlarge):



The shank is larger diameter than a standard bolt, machined to a close tolerance to fit the holes w/out rattling or looseness.

Sean

[Herb Tate]

Thanks!!

[Peewee]

Anyone have a picture f a dowel bolt? Is is the bolt that is only threaded on the end. Sorry for the bad question. To me a bolt is a bolt.

The dowel bolt looks like a normal bolt, that not has a thread over the complete lenght of the bolt.
The difference is in the diameter of the non threaded part of the bolt.
The dowl bolt has a littel bigger diameter to fit snug in the bore on the engine side.





But to the actually question from Dave!

Does anyone know what size bolts to use to mount the bell housing to the transmission and the transmission to the transfers case?
Also should I be using nuts and lock washers anywhere? I have threaded holes but Im not sure if they should be just bolts or have nuts and lock washers on them.

Dave

the bolts should be

Gearbox on bell housing 4 screws 7/16 x 1 1/4 UNC
Transfer Case to Transmission 5 screws 3/8 x 1 1/8 UNC and 5 lock washers
No nuts where used.

Should I use a gasket spray on the paper gasket betw the trans and bell housing? if so do I spray both sides or just one?

No gasked spray is really needed, if you want go safe you could use some sealant in the area around the clutch retainer.

Is there supposed to be a gasket betw the trans and transfer case? or do they just mount together as is?

Yes you should use a gasked between the trans and transfer case and/or some sealant.