Author Topic: Oilpan bolt pattern? (Read 3032 times)

oconnor · « **on:** July 11, 2005, 12:02:44 PM »

Hi all,
I don't yet have a manual.
I've had to replace the oilpan after finding the old unit cracked along the circular depression.
The pan has been oof while I've been looking for the replacement, now I have forgotten the bolt pattern can anyone show me the light?
Thanks in advance.

Bob Wessner · « **Reply #1 on:** July 11, 2005, 12:16:36 PM »

What model/year?

kghost · « **Reply #2 on:** July 11, 2005, 01:19:06 PM »

CB750

eldar · « **Reply #3 on:** July 11, 2005, 02:13:06 PM »

Gee those pics kinda suck, but then most manuals have lousy pics in them to copy!
One thing that could probably be done is to get bolts with the same thread as the stock bolts but make them all the same length, about 1 inch long or so. Then it should not matter. I dont know if anyone else has had to do this but it may be a way to go if the bolts only have to hold on the oilpan.

kghost · « **Reply #4 on:** July 11, 2005, 02:18:55 PM »

Elfdar.....

I think you'll find if you click on the file name below the pictures you can download and blow them up. Detail will then be just fine bro.

Bob Wessner · « **Reply #5 on:** July 11, 2005, 02:24:01 PM »

For some reason, I could not open the first pic. When you say pattern are you referring to the individual bolt characteristics, or their placement? I seem to recall that not all are the same length, so are you looking for how many of each different length?

kghost · « **Reply #6 on:** July 11, 2005, 02:27:32 PM »

Bob,
Seemed to open fine for me.

Oconner

If you need the length I could measure them later tonight at the shop.

eldar · « **Reply #7 on:** July 11, 2005, 02:29:30 PM »

I did open them. A person can figure it out but it would be nice to have a dotted line going from each screw to its respective hole. Just to eliminate mistakes.
This is for those who are not very experienced learning to do the work yourself is hard enough!

Bob Wessner · « **Reply #8 on:** July 11, 2005, 02:42:43 PM »

Here's the skinny on the individual bolts;

4 6x28
1 6x40
1 6x50

Each with a 6mm washer. You can dry fit them through the cover while it's off to verify which goes where. The different lengths accommodate the varying depth of the pan casting.

eldar · « **Reply #9 on:** July 11, 2005, 02:50:04 PM »

Hey Bob, are these bolts only holding the pan on? For some reason I think thats all they do. the length is to make sure the bolts tighten up properly.

kghost · « **Reply #10 on:** July 11, 2005, 03:03:56 PM »

True, they just hold on the pan.

Bob Wessner · « **Reply #11 on:** July 11, 2005, 03:16:31 PM »

Yup, just hold the pan and pan gasket.

eldar · « **Reply #12 on:** July 11, 2005, 03:17:18 PM »

That does make it simpler. Then you just have to make sure the bolts are not too long and could then possibly go with 1 size of bolt. Provided of course the pan is held on securely and there is nothing in the way and no leaks.
I am only saying this since you never know when you might lose a bolt. It would be nice to know that you can use a shorter bolt.

Bob Wessner · « **Reply #13 on:** July 11, 2005, 03:20:45 PM »

Quote

Then you just have to make sure the bolts are not too long and could then possibly go with 1 size of bolt.

I'm not sure this is possible. A couple of the lengths are significantly different for a reason, the pan casting depth. Long enough for the deepest part will likely be too long for the shallow parts.

eldar · « **Reply #14 on:** July 11, 2005, 03:27:02 PM »

Thats possible but it will make it simpler. Instead of 9 bolts (or whatever it is) or 4 different sizes, you may be able to use 2 different sizes or get a size that may be smaller to use in a pinch.

Say you are rolling along and start dropping oil, provided you dont biff it. You could have a couple of spare bolts in your tool pouch and that could allow you to reseal the pan and get home if you have not lost too much oil or can get a little.

It is more of an emergency thing or in a pinch thing.

tmcgee · « **Reply #15 on:** July 11, 2005, 04:34:27 PM »

Speaking about oil pans, mine has a crack up the threads in the drain bolt hole. Any suggestions on how to fix?

eldar · « **Reply #16 on:** July 11, 2005, 07:49:46 PM »

Gee this one is familiar. There are a couple ways to fix it.

The easiest way is to buy one from ebay. But then you have to wait and hope that it actually fits.

I used jbweld to repair the crack then I used a washer that was coated in rubber in place of the normal washer that goes on the oil pan bolt. The rubber will squash to fit and seal and the metal part of the washer will hold its shape. I did this last year and have no leaks.

tmcgee · « **Reply #17 on:** July 12, 2005, 03:59:19 AM »

Wrapping the bolt in teflon tape didn't quite work, but it was the tail end of a roll and prolly not enough. I did think about using a rubber washer (or other goop) after I posted this last night - and then deciding I never should have changed the oil.

I notice yours is also a 1978 model. Possible trend here, I guess.

Mark M · « **Reply #18 on:** July 12, 2005, 07:56:50 AM »

A lack of mechanical sympathy is not exclusive to owners of '78's

Anon.

oconnor · « **Reply #19 on:** July 12, 2005, 10:35:14 AM »

Wow, thanks for all the input guys.
It's a '74 CB750, I just turned over 10,000 miles this spring. I needed to know what bolts go where. I wasn't sure if placement was a big deal as long as I didn't bottom out. None of mine have washers is that bad? My new pan came from Ebay and cost about $15.00 an easy fix.

If the length is because of oilpan thickness I can figure it out, just didn't want to plug an oil galley or something. I'll get some washers on them also.
Thanks again.

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Author Topic: Oilpan bolt pattern? (Read 3032 times)

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