Oil pressure sending unit removal - Alfa Romeo Bulletin Board & Forums
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post #1 of 13 (permalink) Old 03-04-2019, 02:04 PM Thread Starter
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Oil pressure sending unit removal

Help, I have a 78 Alfetta sedan, Euro spec, trying to remove the existing oil pressure sending unit, found out its a 14 mm hex nut, have the 14 mm thin wrench, which is on the shorter side. I can't seem to get enough leverage to start the unit spinning. I have tried the interlocking wrench trick, still a nogo. I suspect it's the original and perhaps never removed. Any thoughts? TIA

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post #2 of 13 (permalink) Old 03-04-2019, 03:49 PM
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Twist harder - counter clockwise. If you are sure the wrench is fitting onto the hex behind the sender (I've seen them with 14mm & 17mm hex) once you get it to move about 1/4 turn it'll probably come out easily. Even with a so-called thin wrench I wasn't always able to get fully on the hex. I got a bicycle wrench - stamped out of 1/8" thick steel & easily bent or cut to a custom size.
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post #3 of 13 (permalink) Old 03-04-2019, 04:09 PM
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Or, a thinned crow's foot socket.

Del

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1989 Milano, Shankle Sport
1991 164S, stock
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previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
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post #4 of 13 (permalink) Old 03-05-2019, 04:05 PM Thread Starter
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Thanks for the ideas, as mentioned it is 14mm, the thin wrench fits suggly on it. I have twisted harder to no avail. I tried a strap wrench, no luck. Love the thin 14mm crow foot idea, I have no problem grinding one down to make it thinner, the problem I forsee is that most of the crow foot wrenchs I've seen have the drive opening for the ratchet rather close to the open end and I doubt the opening will clear the back of the sensor, precluding it's use.
I was able to get vice grips on the sender and have movement, however I think what is happening now is that the sender body is now spinning in the crimped backing that the hex nut attaches to, and the 14mm nut still doesn't turn, so still Working it. Argghhhh

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post #5 of 13 (permalink) Old 03-05-2019, 04:19 PM
But Mad North-Northwest
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Quote:
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I was able to get vice grips on the sender and have movement, however I think what is happening now is that the sender body is now spinning in the crimped backing that the hex nut attaches to
Yep.

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post #6 of 13 (permalink) Old 03-05-2019, 05:36 PM
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+1 or maybe -1. I have tried the strap wrench method and failed miserably.

Ruin a functioning sender!!
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post #7 of 13 (permalink) Old 03-06-2019, 12:47 AM
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original factory wrench looked like this (poor photo, don't have another!)....the simple design allows a grip and gives leverage.

once you have broken the seal, the thing just spins off (well, yours spins already it seems)
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post #8 of 13 (permalink) Old 03-23-2019, 03:40 PM Thread Starter
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Finally beat that mother. I had ordered a 14mm from a place called Bentwrench, which has an offset to allow it to slip behind the sending unit, only after I ground it down to a thinner size, slid right in, but still couldn't budge it. Finally went back to the vice grips, clamped them over the part that folds over the backing plate since the body had been spinning on the backing plate. A little leverage with 17mm wrench finally broke it free, new one installed, didn't know what the next step was going to be, but luckily never had to go that route. Can I get an Amen!

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post #9 of 13 (permalink) Old 03-23-2019, 04:34 PM
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Well done.

Yeah, it's tough to get enough torque with a short wrench. I get a stubby wrench on the nut and then use a 3/8" socket extension and a hammer to whack on it. That usually gets it turning.
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post #10 of 13 (permalink) Old 03-23-2019, 04:38 PM
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Yay! Did you try any Italian swear words? You must include the appropriate wrist action, eh!

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post #11 of 13 (permalink) Old 03-24-2019, 04:41 AM
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Quote:
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Finally beat that mother. , didn't know what the next step was going to be, but luckily never had to go that route. Can I get an Amen!
Congratulations ... not on getting the sender out .. but resisting to put the car on Craigslist. I'm sure it crossed your mind.
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post #12 of 13 (permalink) Old 03-24-2019, 04:45 AM Thread Starter
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Many options went through my mind, however that was not one of them. I was in full McIver mode. Hope all is well!

Cars ruined my life! 😱
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post #13 of 13 (permalink) Old 03-24-2019, 05:00 AM
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Many options went through my mind, however that was not one of them. I was in full McIver mode. Hope all is well!
It will be well when we get to a last frost date as you know!!! Might be sometime in June!!! Opening Day .. April 9 ..Sox 2 tickets on 3rd base .. All is well!
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