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ar4me
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Thread size of oil pressure sender port (for gauge)?

Post by ar4me »

Does anyone know the size of the thread for the oil pressure sender port for the gauge (that is the bulky sender screwed straight down at the back). I thought it was 10 mm with pitch 1.0, but the fitting I have (of that size) does not seem to fit :? It is actually on a 164 3.0 12v in my Milano/75 race car, but I believe it remained the same throughout.
Jes
87 Milano Verde - daily driver - Juliet
87 Milano 3.0 Motronic - budget race car - Roxanne
87 Milano 3.7 24v - race car
(Repeat or do as I say at your own risk - be critical)
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Post by Mats »

if an M10x1 can be screwed in about two turns it's probably a 1/8" NPT. They look VERY similar. Or maybe 3/8" UNF but thats not so likely because it's not tapered.
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Post by Zamani »

I can't remember which of the senders had 2 type of thread pitch. Was it the oil pressure warning light on the head or the oil pressure gauge on the block?

Now that I recall, I think it could be the case as Mats pointed out. If the thread was totally different then I'm sure you wouldn't even attempt to thread it in.

Maybe it was the pressure warning light that had 2 types....
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ar4me
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Post by ar4me »

Yes, the port for the warning light sender came in two threads, but the pitch is obviously different in that cases.

I'll try 1/8 pipe, but the thread on a stock sender does not look tapered at all (and the stock sender uses a crush-washer). Anyway, will try 1/8 - thanks! Given the crush washer, perhaps it is 3/8 UNF then...???

Jes
87 Milano Verde - daily driver - Juliet
87 Milano 3.0 Motronic - budget race car - Roxanne
87 Milano 3.7 24v - race car
(Repeat or do as I say at your own risk - be critical)
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Post by Mats »

If at first you don't succeed... :wink:

I must say I have only seen M10x1 senders on Alfas but on the other hand there are grease monkeys everywhere switching stuff around.
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GTV 2000 -77 - Died in the fire.
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ar4me
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Post by ar4me »

Yeah, yeah, ...

The stock Alfa sender spins in freely, so the thread should be "original". For good measure I'm also going to chase the threads on my 10x1.0 fitting with a 10x1.0 from my tap-and-die set to see if that helps - perhaps it is a bit off - after all it is an American metric fitting, so who knows :lol: though, possibly made in China :roll:

Jes
87 Milano Verde - daily driver - Juliet
87 Milano 3.0 Motronic - budget race car - Roxanne
87 Milano 3.7 24v - race car
(Repeat or do as I say at your own risk - be critical)
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ar4me
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Post by ar4me »

It is 10x1 mm. A 10x1 mm bolt spins into the port freely, and a 10x1 mm nut spins freely onto the stock sender. I traced my (questionable) fitting with a die and it now also spins in freely :twisted: Even the other end of the fitting was a poor fit - AN3 :roll: But it all went together :D
Jes
87 Milano Verde - daily driver - Juliet
87 Milano 3.0 Motronic - budget race car - Roxanne
87 Milano 3.7 24v - race car
(Repeat or do as I say at your own risk - be critical)
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Post by Mats »

Nice. :)
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-Strandberg.photography-

GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
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Oil Pressure Sender Unit removal

Post by Alfaboy1970 »

I have bought a new oil pressure sender unit for my 3.0 GTV6 from e b spares in the uk. I am having some difficulty getting the old one out cant turn by hand so looks as if I am going to need a right ankle open ended spanner is this the usual sort of tool or is there a better way to remove these?
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