I am rebuilding my fuel pump and discovered that this piece has a small bend at the tip. Is it designed to be that way? I believe this is referred to as the rocker arm. I can't image how it would get bent inside the pump, but it looks weird.
Fuel Pump Rocker Arm - Bent by Design
- Dennis Vogel
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Fuel Pump Rocker Arm - Bent by Design
1960 356 S90 Sunroof Coupe
1970 914-6
2014 Carrera S
1970 914-6
2014 Carrera S
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- 356 Fan
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Re: Fuel Pump Rocker Arm - Bent by Design
It should be flat, but being hardened, It's hard to believe it's bent; Possibly the pump's pushrod isn't square on the end (from a modification?) and lack of enough grease in the cavity, it forced the arm's contact to 1-side.
OR--the pivot hole in the arm is sloppy(?)
The arm doesn't look like it's shape isn't correct(?)--it's been awhile since seeing one; None in my archives.
OR--the pivot hole in the arm is sloppy(?)
The arm doesn't look like it's shape isn't correct(?)--it's been awhile since seeing one; None in my archives.
- Ron LaDow
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Re: Fuel Pump Rocker Arm - Bent by Design
The wear pattern tells you something is wrong:
I don't know beans about early fuel pumps, but that wear pattern tells me you need a new part.
At "A", the wear is offset. At "B", it is offset and not normal to the axis of the part or the pivot C/L.I don't know beans about early fuel pumps, but that wear pattern tells me you need a new part.
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
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Re: Fuel Pump Rocker Arm - Bent by Design
Speaking of new parts, does anyone know of a source for this piece as well as the rocker arm?
BTW, this piece on my '58 cab looks just like the one in the picture as does an aftermarket one I purchased many years ago. Both have the bend.
BTW, this piece on my '58 cab looks just like the one in the picture as does an aftermarket one I purchased many years ago. Both have the bend.
Spike Jones
'58 Cab
'58 Cab
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Re: Fuel Pump Rocker Arm - Bent by Design
Wear pattern? That is not a wear pattern.
That is the pattern left by the shearing of the steel when it was punched out of a sheet. It is bent because the sheet steel had no strength in that direction during the punching / shearing process.
Look up fine blanking.
(typed by early morning sore head)
That is the pattern left by the shearing of the steel when it was punched out of a sheet. It is bent because the sheet steel had no strength in that direction during the punching / shearing process.
Look up fine blanking.
(typed by early morning sore head)
- Vic Skirmants
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Re: Fuel Pump Rocker Arm - Bent by Design
Doesn't that "bend" go into a slot in the diaphragm rod? It helps to keep it from disengaging from the slot. That's why they are ALL bent!
- Bruce Smith
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Re: Fuel Pump Rocker Arm - Bent by Design
YesVic Skirmants wrote: ↑Mon Jun 03, 2019 7:48 am Doesn't that "bend" go into a slot in the diaphragm rod? It helps to keep it from disengaging from the slot. That's why they are ALL bent!
Bruce Smith
- Dennis Vogel
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Re: Fuel Pump Rocker Arm - Bent by Design
Thanks Vic. Makes more sense now.Vic Skirmants wrote: ↑Mon Jun 03, 2019 7:48 am Doesn't that "bend" go into a slot in the diaphragm rod? It helps to keep it from disengaging from the slot. That's why they are ALL bent!
1960 356 S90 Sunroof Coupe
1970 914-6
2014 Carrera S
1970 914-6
2014 Carrera S
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Re: Fuel Pump Rocker Arm - Bent by Design
Dennis and all,
I'll correct myself that the tip of the pump's rocker arm has a slight bend to allow the diapham's slotted tip to get 'hooked' to the the rocker arm's tip to stay engaged when slightly twisting the top 1/2 of the pump to line up to the screw holes.
Years ago, I had the pump's pivot pin almost out of it's retainment (not having the tru-arc rings) and was able to re-hook the diaphram's slotted end to the rocker arm w/o having to remove the whole pump from the engine--since I was still on the road going home; Of course, I had to remove the top 1/2 to 'hook' it--luck was w/me!!!
I'll correct myself that the tip of the pump's rocker arm has a slight bend to allow the diapham's slotted tip to get 'hooked' to the the rocker arm's tip to stay engaged when slightly twisting the top 1/2 of the pump to line up to the screw holes.
Years ago, I had the pump's pivot pin almost out of it's retainment (not having the tru-arc rings) and was able to re-hook the diaphram's slotted end to the rocker arm w/o having to remove the whole pump from the engine--since I was still on the road going home; Of course, I had to remove the top 1/2 to 'hook' it--luck was w/me!!!