Oil Pressure/Ignition Switch

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JPowers
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#1 Oil Pressure/Ignition Switch

Post by JPowers » Sun Mar 14, 2021 9:05 pm

Hi,
I'm putting the pieces back onto the engine of my 1966 4.2L FHC. The engine is not original and comes from a later 2+2 (block was cast in May of '66) and never had the block-mounted switch for the ignition/oil pressure warning lamp. I do have the wiring for it however (brown w/ black fabric coated wire from ignition warning lamp.) The bolts along the oil gallery on the right side of the block are intact and appear to have always been so. According to all of the available wiring diagrams, I should have originally had this switch. Can I remove the bolt closest to the motor mount on the right hand side and install an ignition/oil pressure lamp switch where it would originally have been mounted?
Jim
66 FHC

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christopher storey
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#2 Re: Oil Pressure/Ignition Switch

Post by christopher storey » Mon Mar 15, 2021 7:56 am

Yes , any of the positions will do. Just make sure you don't lose the copper washer which should be under the bolt

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#3 Re: Oil Pressure/Ignition Switch

Post by JPowers » Mon Mar 15, 2021 2:09 pm

Ok, great.

Thanks for your help
Jim
Jim
66 FHC

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mtnjag
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#4 Re: Oil Pressure/Ignition Switch

Post by mtnjag » Wed Apr 14, 2021 11:40 pm

Is that port BSPT, BSPP, or unlikely 3/8” NPT?

If it takes a washer s/b BSPP.
Layne
Car #876005, 62 OTS

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Gérard A110
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#5 Re: Oil Pressure/Ignition Switch

Post by Gérard A110 » Thu Apr 15, 2021 8:00 am

it is in Withworth BSW, UNF , like all others on engine.
E ots 1962, mk2 3.8 1964, SM 1970, A110 1970, A310 1973, Grégoire 1954

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#6 Re: Oil Pressure/Ignition Switch

Post by mtnjag » Thu Apr 15, 2021 12:57 pm

Is BSW the same as the BSPP?
Layne
Car #876005, 62 OTS

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#7 Re: Oil Pressure/Ignition Switch

Post by mtnjag » Thu Apr 15, 2021 1:14 pm

I see, same as UNF. Typical fine thread found in US hardware.
Layne
Car #876005, 62 OTS

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#8 Re: Oil Pressure/Ignition Switch

Post by mtnjag » Thu Apr 15, 2021 3:19 pm

Well, pretty close anyway.
Layne
Car #876005, 62 OTS

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Tom W
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#9 Re: Oil Pressure/Ignition Switch

Post by Tom W » Thu Apr 15, 2021 4:14 pm

UNF isn’t the same as Whitworth or BSPP.

UNF uses a 60 degree thread form, whilst Whitworth is 55 degrees. BSPP uses a Whitworth thread form.

1/4 BSPP is 19tpi. 1/2” UNF is the closest dimensionally, but is 20tpi. So over a short length they may appear compatible, but they’re not.

Edit: The plugs are described as 1/2” UNF by the usual parts suppliers.
Tom
1970 S2 FHC

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#10 Re: Oil Pressure/Ignition Switch

Post by mtnjag » Thu Apr 15, 2021 4:22 pm

So for the sake of the original question from a Member in the US, what adapter would he use in the oil galley to get to a typical US 1/8” MPT?

Would a male 1/8” BSPP adapt with washer to 1/8” FPT work?
Layne
Car #876005, 62 OTS

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#11 Re: Oil Pressure/Ignition Switch

Post by Tom W » Thu Apr 15, 2021 4:39 pm

The bung is 1/2” UNF, so the hole in the block will be 1/2” UNF.

So the adapter will need to be male 1/2” UNF to whatever suits the available pressure switch.

Or use a 1/2” UNF pressure switch.
Tom
1970 S2 FHC

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#12 Re: Oil Pressure/Ignition Switch

Post by mtnjag » Fri Apr 16, 2021 12:22 pm

So i had always thought the nuts and bolts on the block, except perhaps the sump drain and water jacket bung which i thought were BSPP, were UNF and have always used such for replacement when needed.

It is mentioned in a post above that they are BSW and UNF which are close but are not the same.

Where have i been wrong?
Layne
Car #876005, 62 OTS

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#13 Re: Oil Pressure/Ignition Switch

Post by christopher storey » Fri Apr 16, 2021 1:21 pm

The parts list shows the plugs as C2352, and the copper washers as C2296/3 . The list does not give size or thread, but I am pretty sure that , like virtually all the cast iron threads they will be UNF. I cannot think of another fastening/closure on the car which uses BSF , and the only Whitworth fastening I can think of is the timing chain adjuster locknut which is from memory 1/2" Whit

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#14 Re: Oil Pressure/Ignition Switch

Post by christopher storey » Fri Apr 16, 2021 1:26 pm

The parts list shows the plugs as C2352, and the copper washers as C2296/3 . The list does not give thread, and the SNG Barrett website merely sizes them as 1/2". I cannot think of another fastening/closure on the car which uses BSF , and the only Whitworth fastening I can think of is the timing chain adjuster locknut which is from memory 1/2" Whit . If I get a chance I will take one out of one of my cars and check its thread

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