oil pan quetsions

[kyleputzier]

I have a 1999 5.7GSPWTR that needs a new oil pan. I ordered an oil pan from another company that sells Basic Powerboat engine parts that was to fit a small block GM in the 1999 era. When I received it, everything looks correct except my old oil pan has what I would call an external dipstick. The dipstick tube goes all the way to the bottom of the oil pan (on the outside) and then connects to a small metal block that is attached to the drain hole of the oil via a banjo bolt. The normal place the dipstick tube connects to the engine has been sealed with a plug. The banjo bolt has what appears to be 1/2-20 threads. The new oil pan has 1/2-13 threads.
The part number for an oem pan is 3857778. It's very expensive. I can cross this oem part number with a pan from the other place that is considerably less expensive.

My questions are:

Is 1/2-20 threads normal for a VP pan while others are 1/2-13?

Why does my existing pan have an external dipstick? Is that normal for a VP?

I don't want to keep buying, and returning, pans only to find out that my existing pan and dipstick has been modified for some reason.

Kyle

 

[kyleputzier]

Re: oil pan quetsions

I now know that my existing oil pan has a metric M12-1.75 plug.
Is this normal for Volvo Penta?

 

[denisb]

Re: oil pan quetsions

I just went throught is with my 4.3

First thought, if you look at your old oil pan you will see a thread insert that reduces the thread to M12. You can try to remove it (I removed mine by carefully cutting it out).
because I had changed to an older style motor, I found that a steel oil pan had differnt threads than the old (aluminum) pan did.
So I had a machinist make me a complete bolt that had the threads I needed. The new bolt looks and works perfect.

You could try to find an adapter, but I had no luck and besides the threads are too close to have an adapter that does not push the assembly farther from the pan.

the thread you are looking at are: M12x1.75 and M14x1.75.

I hope this helps.

 

[Bondo]

Re: oil pan quetsions

Ayuh,... 1/2- 20 was standard Chevy for Years, 'n Years...

1/2- 13 sounds Chinese...