Fuel Pump Rebuild - VW Tool 328d

66foot · Posted: Sun Apr 15, 2007 8:46 am Post subject: Fuel Pump Rebuild - VW Tool 328d

I do not have a VW tool 328d - fuel pump diaphragm guage.

I can make a rig that will serve the same purpose of setting the pretension on the diaphragm at 14 mm.

Does anyone know the purpose of this preset?

MedicTed · Posted: Sun Apr 15, 2007 8:53 am Post subject:

It is to assure that the diaphram deflects the proper amount. If it over extrends it could cause premature failure.
_________________
Ted Wojton
70 VW Bus Westfalia camper
2003 GMC Sierra

66foot · Posted: Sun Apr 15, 2007 8:59 am Post subject:

Ted -

Are you saying that by having the fuel pump mounted to the 328d tool that the diaphragm is raised the proper amount before the top section is put back on - thus giving the diaphragm the correct "stretch"?

Pat

The Pirate · Posted: Sun Apr 15, 2007 9:54 am Post subject:

Three things.

one- There seems to be two diffrent gauges with diffrent center pin heights. Which one is for what pumps?

two- What are the measurements of those pins from the bottom of the plate to the top of the pin?

Three- Can any one describe in detail or with pictures how the tool is used?
_________________
74 super beetle AKA The Pirate.

We are currently offering a rebuild service for Beetle rack and pinion steering units. PM for details.

Service with a Yahhrrr.

66foot · Posted: Sun Apr 15, 2007 10:28 am Post subject:

Pirate: Good point.

According to Bill Bowman at:

http://www.type2.com/library/fuel/fpreb.htm

The 328b is for the 25hp and 36hp and depresses the rocker arm 35 mm as measured from the base of the fuel pump.

The 328d is for the 40hp and depresses the rocker arm 14 mm as measured from the base of the fuel pump.

According to the TheSamba VW tool list the 328b is for type 1 with chassis number up to 3 192 506.

By looking at the pictures, it appears that the fuel pump base is just pushed down onto the 328b, whereas with the 328d the fuel pump base in bolted on to the tool.

I have a lot of manuals, but I do not believe that any of them discuss this tool.

Pat

The Pirate · Posted: Sun Apr 15, 2007 1:35 pm Post subject:

I know I have quite a few german rebuildable fule pumps laying around. I have some intrest from people with stock motors and a few with 1776s and such. I would like to rebuild and sell these but i would like to do it right.
_________________
74 super beetle AKA The Pirate.

We are currently offering a rebuild service for Beetle rack and pinion steering units. PM for details.

Service with a Yahhrrr.

66foot · Posted: Sun Apr 15, 2007 1:46 pm Post subject:

FYI

This issue was addressed on TheSamba in 2005.

Home-made Fuel Pump Rebuilding Jig (aka VW Tool 328d)

I would think that a similar home-made tool could be made with an old bakelite intermediate flange and some threaded stock the o.d. of the push rod.

Pat

The Pirate · Posted: Sun Apr 15, 2007 2:10 pm Post subject:

Sweet now I am set! I can build one of those in like 30 minutes!
_________________
74 super beetle AKA The Pirate.

We are currently offering a rebuild service for Beetle rack and pinion steering units. PM for details.

Service with a Yahhrrr.

66foot · Posted: Sun Apr 15, 2007 10:40 pm Post subject:

If you are performing a fuel pump rebuild and you do not have a VW tool 328d (fuel pump diaphragm gauge) then you can make a simple jig yourself. If you have an extra intermediate flange then you can make a VW tool 328d or 328b to preset the tension on the fuel pump rocker arm. An example is demonstrated below. For a 328d, just set the center bolt stock with your calipers to 14 mm, then tighten down the locking nuts and you are ready to mount your fuel pump and finish your rebuild.

Image may have been reduced in size. Click image to view fullscreen.

Pat

Nessy · Posted: Tue Apr 24, 2007 6:42 pm Post subject:

I have a boxed set of tools 328c and 328d, bought at a VW swapmeet many years ago.........a 1960 official VW Workshop manual describes their use , yet strangely the Bentley manual doesn't mention their use at all....
328c is used to check the correct stroke of the fuel pump pushrod; it is bolted to the fuel pump flange , the engine is turned over by hand and there should be a 5mm range of movement (as indicated by the 8mm and 13mm markings visible on its scale in the 3rd pic , left hand side item).
328d as already described in posts above is used to pre-load the pump diaphragm when re-assembling the fuel pump.
I shall soon be putting these to use when I rebuild my own fuel pump Wink

.

_________________
1972 1302LS Convertible RHD

66foot · Posted: Tue Apr 24, 2007 8:35 pm Post subject:

Nessy -

Way cool. Now that is what I needed a few days ago.

A set like yours just sold three weeks ago on ebay, missed those also.

Well, in the world of VW's you have to learn to improvise. My little jig did the trick.

Thanks for sharing.

Pat

Nessy · Posted: Tue Apr 24, 2007 11:57 pm Post subject:

JeffRens

Looking up how to do this... saw a couple of ways to set the preload for the fuel pump diaphragm and thought I'd share my 2 cents. I used this cheap steering wheel puller to set the 14mm preload distance. (So exiting when something works I wanted to share.)

Question... I feel inclined to use some sort of sealer to guarantee a leakproof seal before cranking the top down on the diaphragm... good idea, or not... Thanks


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