Merc pt early design o-rings

[9D280]

My pt assy under the pump has a plastic screw in thing to hold the relief valve in. I think this may have been an early design, as i can't find it on any microfiche and any i see show the relief valve being assembled from the pump - piston split. This one comes out the same way as the bypass valve.

Can any of you Merc experts out there shed any light on the size of the o-ring that seals it from the outside world or an online 'fiche?

Thanks.

[Turbodiesel]

Any idea what your serial number is?

[9D280]

Serial number??? The engine is a mix of Merc & Mariner bits from I guess 1970 to 1989! The PT hydraulic bits are off a Mariner, the motor & tank assy off a Mercruiser leg.....

So, no, unfortunately not!

The only thing that is different to what I can see on the microfiches is the "blanking plug" for the relief valve (the one at the transom side of the three "cross casting passages" where most seem to assemble from the pump - piston split flange. I took that out to clean the assembly up, although I am wondering if it;s not meant t obe removed, hence no spares.

I have seen pictorial reference to it in a Clymer, but can't find any info or a part number on the microfiches....

[Turbodiesel]

Does it look like this one or is it older?

[Turbodiesel]

Or this one?

[9D280]

Turbo,

It's mostly like the first one, but the motor / tank assy has a round bodied motor top, and the "item 13" bits go in from the same side as the bypass valve (item 16).

There is a small version of Item 16 to let all the "item 13 gubbins" out, which if my memory serves correctly has a small pin on the fluid end to locate the valve spring.

[9D280]

Should have also said, Clymer implied it was a "design 1" - makes sense I guess if design 2 removed a couple of unnecessary components?