Oil temp sender on GSO-540

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Dirtman
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Oil temp sender on GSO-540

Postby Dirtman » Wed Jan 02, 2019 8:07 pm

I'm having a problem I'm sure others have run into but haven't been able to find a tread here that talks about this problem. I removed the old aircraft temp sender on my GSO540 and it is a 5/8-18(fine) thread that seals with a copper gasket. Went with an Autometer electric temp gauge on the new build and the senders for the gauge are pipe thread, Called Autometer and the local NAPA store and no one seems to make an adapter to go from one to the other. Has anyone ran into this problem and how did you go about fixing it. Thought that maybe a hydraulic fitting might adapt it over but haven't been able to locate one of those either. Any help would be appreciated. :banghead:
IO520 on a 12"6" Lazer with a 72" Q #20814
Build in progress: 14x7'9" JB w/ GSO540 &80" Razor

One Eyed Gator
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Re: Oil temp sender on GSO-540

Postby One Eyed Gator » Thu Jan 03, 2019 7:14 am

Couldn't you get a 5/8-18" plug , then drill and tap it to the size you need.

Just an Idea

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Slidin Gator
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Re: Oil temp sender on GSO-540

Postby Slidin Gator » Thu Jan 03, 2019 9:59 am

5/8-18 is the thread size on a -6 size, 45 degree flare fitting.

Parker part number 46F-6-2 has a 5/8 threaded male flare end and a 1/8" NPT female, but the hex size is 5/8" (same size as the thread).
P/N 46F-6-4 has a 1/4" female NPT and an 11/16" hex, which may be large enough to match the copper gasket.
P/N 46F-6-6 has a 3/8" female NPT and a 13/16" hex which should definitely be large enough for the gasket.

The other option is a 5/8" bolt with a 15/16" hex, drill and tap for the pipe thread.
I grew up thinking I-10 was the Mason Dixon line.
1986 Airboat Engineering Inc., 14' Marsh Master. Refreshed narrow deck, SV O-540, 72” NGQ. A Bob Stossel original.

Dirtman
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Re: Oil temp sender on GSO-540

Postby Dirtman » Thu Jan 03, 2019 9:17 pm

Thanks for the suggestions. I'll start looking for the Parker fitting tomorrow
IO520 on a 12"6" Lazer with a 72" Q #20814
Build in progress: 14x7'9" JB w/ GSO540 &80" Razor

terrible ted
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Re: Oil temp sender on GSO-540

Postby terrible ted » Mon Jan 07, 2019 12:54 pm

How do you like the GSO540. I wonder if it is worth converting back to one- My blocks a VO made to accept a gear box and we converted it to direct drive. I would have to get a crank and box. I alway wonder if it will eat more fuel or be about the same.

Dirtman
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Re: Oil temp sender on GSO-540

Postby Dirtman » Fri Jan 11, 2019 3:14 pm

Ted I wish I could tell you this has been a build that has been going on for toooooo long for various reasons(some of it me but some of it others) I am looking forward to getting it in the water soon and I'll let you know.
IO520 on a 12"6" Lazer with a 72" Q #20814
Build in progress: 14x7'9" JB w/ GSO540 &80" Razor

Seadrift
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Re: Oil temp sender on GSO-540

Postby Seadrift » Fri Feb 15, 2019 11:25 pm

Drill & tap to NPT (nominal pipe thread) , need not a washer with pipe threads. just don't get carried away tighting . the housing is aluminum. fyi put mine in vice between two blocks of wood for support while tapping. good luck
2000 Combee 18' / TIO 541 Don't laff, it takes me there and brings me back.

hdsadey
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Re: Oil temp sender on GSO-540

Postby hdsadey » Sun Feb 17, 2019 6:43 pm

Summit racing. Looks like this is the fitting you need. Description is wrong I think. Should be 5/8-18 male straight thread and 1/4 female NPT.
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Dirtman
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Re: Oil temp sender on GSO-540

Postby Dirtman » Tue Feb 19, 2019 8:39 pm

Thanks for all the input. I was able to go to a hydraulic repair shop and actually have a fitting machined to fit. Went together and looks like it will work out fine.
IO520 on a 12"6" Lazer with a 72" Q #20814
Build in progress: 14x7'9" JB w/ GSO540 &80" Razor


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