Type 4 Oil pump replace with engine in

[kingkitesurf]

Is it possible and doable to replace the stock oil pump on a type 4 with the engine in.

[Ericlottaallthat]

It is possible but it would probably be easier to go ahead and remove the engine as the exhaust, mustache bar and fan shroud along with some cooling tins have to be removed to access it.

[WhirledTraveller]

It's not that hard. I've done it several times.

You don't need to remove the exhaust OR the mustache bar if you can remove the fan shroud studs. They are difficult to double nut but you might be able to pull it off. Easier to tack weld the nuts onto the studs which turns them into bolts.

Basic steps, from memory

1) Remove the fan cover and loosen the alternator, remove belt
2) Remove foam seal from the area and remove 3 pieces of tin. The obvious ones. You have to remove the oil fill port to do this.
3) Unbolt and remove the fan
4) Unbolt the coil and move it out of the way.
5) Loosen the top tin
6) Remove those pesky 4 studs from the fan shroud
7) Remove attachments from fan shroud to exhaust (if they're still there)
Remove fan shroud

Voila. Now you have access to the pump.
_________________
1977 Westy, Automatic. Big Valve heads, CS Cam.

[timvw7476]

Just keep in mind you may have to loosen some of the smaller stud
nuts along that perimeter of the case. And a couple pry bars for the 'ears'
on the original pump, so the body does not cock in the case recess when
prying it out.

[aeromech]

Why do you believe you need a new pump? Did it suck something into it and shear? Are you having low oil pressure at idle? What’s the problem?
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Aang]

[aeromech]

Are you seeing low oil pressure at idle or all the time. My point is you may have a good pump but an internal leak in another place. You might change the pump and find out later it was all for naught.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Aang]

[aeromech]

[RalphWiggam]

[Ericlottaallthat]

How do you check the bypass plunger?

[aeromech]

To check the plunger:

First off, the plunger is hard steel. The bore it moves in is soft magnesium. Over the life of your engine case it’s very possible that there exists extreme wear now which can cause an internal leak in your oiling system.

1). Go under the engine and look up. Near the oil pump you should find a steel plug with a straight slot in the head to accept a very large screwdriver tip.
2). Get an oil catch pan and place under
3). Remove the plug by turning ccw
4). The plug, a spring, and the plunger should now fall into the pan
5). You don’t need to drain the engine oil. Only a small amount with come
6). Inspect the plunger and bore looking for wear
7). If needed do some cleaning
. The plunger has a hole in one end, either buy the proper tool a
Or make something to hold the plunger. Some people will use a wooden dowel for this.
9). Now slide the plunger up into the bore and feel for side play. It should be a close fit and not flop around much.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Wasted youth]

Here is where to need to be to get near the oil pump and what you need to remove to get there:

[Aang]

[quote="RalphWiggam"]

[Wasted youth]

There are a number of folks who have removed the studs and replaced them with bolts to make jobs like this easier.

[aeromech]

Where did my quote come from? I don’t remember ever having success with something from any company called tangerine racing. I’ve always custom made a new plunger and reamed the bore
Type 4 motors only have one bypass unlike my 1971 type 1.
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[timvw7476]

[Aang]

[aeromech]

Can you post a pic of that? Ah, there is a horizontal bypass located under #1 piston I wasn’t thinking of
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[Aang]