Tach Drive Oil Pump Plug Removal

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Dennis Vogel
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Tach Drive Oil Pump Plug Removal

#1 Post by Dennis Vogel » Wed Aug 14, 2019 6:49 pm

Is there some trick for getting the tach drive oil pump plug off? I've soaked it in Kroil for days and it doesn't want to budge. I'm reluctant to muscle it off for fear of damaging something.
TachDriveOilPumpPlug.JPG
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1960 356 S90 Sunroof Coupe
2014 Carrera S

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Ron LaDow
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Re: Tach Drive Oil Pump Plug Removal

#2 Post by Ron LaDow » Thu Aug 15, 2019 1:06 am

It's already oil-soaked from the inside. I'd put it in a vise with a piece of plywood on both sides and lean on the socket driver. Or if you have an impact wrench, do the same an use that.
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Harlan Halsey
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Re: Tach Drive Oil Pump Plug Removal

#3 Post by Harlan Halsey » Thu Aug 15, 2019 3:03 am

I usually go to heat after penetrating oil, particularly when the steel part is in aluminum. We used to call it the acetelene wrench.

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Re: Tach Drive Oil Pump Plug Removal

#4 Post by Tim Berardelli » Thu Aug 15, 2019 5:19 pm

Why are you removing the oil pump plug? Do believe there is excess "end play" in the gear that requires a thicker shim?

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Dennis Vogel
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Re: Tach Drive Oil Pump Plug Removal

#5 Post by Dennis Vogel » Mon Dec 16, 2019 11:15 am

Tim Berardelli wrote:
Thu Aug 15, 2019 5:19 pm
Why are you removing the oil pump plug? Do believe there is excess "end play" in the gear that requires a thicker shim?
To be honest, I was just assuming that it deserved cleaning and inspection. I know, I know. "Assume makes an Ass out of U and ME", to quote Pellow. If disassembly is unnecessary, that would be great.

Almost everything I've touched on this engine has been incorrect and / or so badly worn it needed replacing. The exceptions I can think of are the case, heads, carbs, and camshaft.
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Don Gale
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Re: Tach Drive Oil Pump Plug Removal

#6 Post by Don Gale » Mon Dec 16, 2019 11:19 am

ditto, heat. Play a propane torch around the sides of the threaded boss. No need to get excessively hot.
1958 356A 1600 Super Sunroof Coupe
former 1966 Euro 912 Sunroof
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Bruce Smith
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Re: Tach Drive Oil Pump Plug Removal

#7 Post by Bruce Smith » Mon Dec 16, 2019 11:50 am

Muscle it off. Use a new crush washer when re-assembling and wire it secure.
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Ted Hedman
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Re: Tach Drive Oil Pump Plug Removal

#8 Post by Ted Hedman » Wed Dec 25, 2019 2:24 am

I got nervous with a 2' pipe on my wrench and ended up zipping it off with a battery powered impact gun. I don't think mine had ever been removed. Wonder what the factory torque spec is?
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Wes Bender
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Re: Tach Drive Oil Pump Plug Removal

#9 Post by Wes Bender » Wed Dec 25, 2019 11:31 am

Just tight enough that it doesn't leak. Then safety wire it.
Some days it just isn’t worth the hassle of chewing through the restraints......

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Re: Tach Drive Oil Pump Plug Removal

#10 Post by Dennis Vogel » Fri Dec 27, 2019 5:16 pm

A combination of torch, 1/2 drive socket, and rubber mallet finally freed it. I'm glad I did it, as the inside is looking pretty gunked. I think that's the appropriate technical term.
OilPumpDriveInside.jpg
OilPumpDriveInside.jpg (275.2 KiB) Viewed 854 times
The parts catalog references a Thrust Washer (369.05.718) of varying thickness (.8, .6, or .5mm) with quantity X. I assume this is to adjust the end play that Tim references. Where is acceptable endplay defined? I don't see instructions for assembly or assessment in the workshop manual. I don't see that an existing spacer is in ours. Searches of the forum seem to yield a result of near zero? Is that the answer? I'm not clear if I need one, and if so what thickness...
OilPumpComponentsFromPartsManual.png
OilPumpComponentsFromPartsManual.png (107.48 KiB) Viewed 854 times
Should the pinion #69 be able to removed from the housing now that the pressure screw is off? Ours seems captured.
1960 356 S90 Sunroof Coupe
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Re: Tach Drive Oil Pump Plug Removal

#11 Post by Geoff Fleming » Fri Dec 27, 2019 6:40 pm

Just use a wood block or dowel and tap with a small hammer...the tang will pop out at the other end.

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Vic Skirmants
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Re: Tach Drive Oil Pump Plug Removal

#12 Post by Vic Skirmants » Sat Dec 28, 2019 8:36 am

Geoff Fleming wrote:
Fri Dec 27, 2019 6:40 pm
Just use a wood block or dowel and tap with a small hammer...the tang will pop out at the other end.
Geoff; that's a little confusing. Do you mean the gear will pop out?
Dennis; yes, you need a shim. I don't think I have ever seen all the listed thickness ones available.

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Re: Tach Drive Oil Pump Plug Removal

#13 Post by Geoff Fleming » Sat Dec 28, 2019 12:20 pm

Yes...assuming, of course, the unit has been removed from the engine and the gear shaft is being held captive by coagulated oil/gunk.

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