Type 4 timing.

[busdaddy]

Oil cooler, cooler seals or even the gasket between the oil filter mount and the case. There's also a number of gallery plugs in that area that like to get loose.

But first start at the very top, the oil pressure sender is often to blame.
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[Wildthings]

The Type 4 oil pressure switches are pretty well hidden down in a well, and are notorious for failing. The type 4 switch has tapered pipe threads while the Type 1 switch has straight threads and uses a sealing ring, so make sure you get the correct one. If you are unfamiliar with pipe threads in general, look the tightening spec up in the Bentley. IIRC it takes a 24mm deep socket (15/16" also works fine) to change it.

[75 Westy FI noob]

This raises the question of … the Tins.

Can they be (easily)removed from a FI Type 4 with the engine in?
Or do the plenum and intakes need to come off first?

I think the oil pressure sender is under the tin.

I really don’t wanna pull the engine / trans out.

[dodger tom]

[quote="75 Westy FI noob]I think the oil pressure sender is under the tin.

I really don’t wanna pull the engine / trans out. [/quote]

you don’t need to remove tins. the switch is behind the distributor. just pull the wire, and use a socket to loosen the switch.

_________________
1978 Champaign Edition 2 Westfalia
Would never find the time to keep up another classic air-cooled.

[busdaddy]

As Tom states the sender doesn't require tin removal to look at or replace, if it's oily down in there shoot some degreaser in there and blast it with the hose (don't drown the distributor on the way in), if it's oily again in a few days you might have found the issue.

If it's dry your next bst option may be to pull the fan shroud, you can clean it up and run it without the shroud a few minutes in the driveway and see where the oil originates. It may be worthwhile anyways if it's been sitting, rodents like to move in and you may find a few of their homes.
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Rust NEVER sleeps and stock never goes out of style.

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[75 Westy FI noob]

Thanks!

[75 Westy FI noob]

ps: I Hate the tins. Imagine dropping that nut in that hole. They made intalling the head temp sensor ridiculously difficult. Caused me to cross thread a spark plug while Removing it…. Nightmares.

I guess removing the fan shroud would grant some access to retrieve lost bits.

I need to check btw the jugs for nests….

[dodger tom]

i’m with you, man. i dropped #2 spark plug on top of the cylinders once. took me an hour to fish it out.

mindfulness is your friend when working on a type iv engine. firm grasp. eyes on the prize. then, you’ll only drop some stuff down into the tins.
_________________
1978 Champaign Edition 2 Westfalia
Would never find the time to keep up another classic air-cooled.

[timvw7476]

[my59]

I have a rubber sleeve gizmo gifted by a friend. You fit the plug in one end, and it is long enough so you can reach in and get the spark plug hand started before you put a socket on it.
When I pulled the bus engine the first time there were 2 spark plugs and a socket lying under the tins.
_________________
my59: Well son, my grandfather died before I got to drive it, so does that answer your question?
our79: sunroof bus w/camper interior and 2.0 FI
Other:'12 Jetta, '77 Benz 300D, and a 74 MG Midget.

[Wildthings]

Changing the oil pressure switch with the tin installed is easy enough, but the need to use a 24mm socket to remove and install it means you are likely going to be using a 1/2" drive ratchet which can easily apply way too much torque to the small diameter (10mm) pipe fitting where the switch screws into the block. Snap it off or worse crack the block and you have big problems.

[bsairhead]

[75 Westy FI noob]

Good tip Wild Things… will try and remember not to crank it too hard.

I have a spark plug socket w a rubber grommet in it, causes the socket to stick firm, then the grommet stays on. So, when i was taking it out, I didn’t put it all the way on, just shy about 20%. Well, that was enough for the socket to be too tall to clear the tin. But it was the last 3 threads or so and i didnt even feel it.

Other than that goof, I’ve only dropped the heater fan fuse down in the tins. Been careful as i can.

[cellobus1]

I’m reading through this thread and remembering a time when I was changing spark plugs on a type IV and one of them slipped out of of the socket. I made the mistake of trying to fish out the plug with my fingers. I think it was cylinder 3 which looks like it’s an easy reach. DO NOT ever stick 2 fingers in a spark plug tin hole, you will be sitting there a long time trying to get them out, or you will flense them to a bloody mess if you’re in a hurry.
_________________
1976 unrestored daily driver Standard bus, "Stella"
formerly, 1959 Standard bus
formerly, 1973 transporter which was 4 years old when it taught me to drive

[75 Westy FI noob]

Got my timing scale from Busted Bus …

Big red dot at 5 atdc.

But, I should actually set timing at 7.5 btdc …is that correct ?

Found idle screw info in my Bentley manual.

Gonna start it again today.
70 degrees in late December? I’ll take it. The Good Lord know I wanna work on the bus.

[busdaddy]

Disregard the dot, that's for a different distributor, yours should idle ~7.5* BTDC.
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Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
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[Wildthings]

[75 Westy FI noob]

Thanks guys… I’ll put the notch at 7.5 btdc and see how she does.
I have an aftermarket dist.. no vacc lines on it.

That big shiny mark to the left was mde by yours truly, trying to do it by valve position. I was off a bit.

Glad I found the notch. haha

[75 Westy FI noob]

[Wildthings]

Pulling the shroud is a PITA. You kind of have a choice as to which way you go at it. You can pull the heat exchangers, which means pulling the entire exhaust, or you can remove the 4 studs that hold the fan shroud to the block and lift the fan shroud up out of the heat exchangers. There are a few other tricks that were done when these things were new and it was expected they would be junked within a half dozen years, but most don't want to damage rare expensive parts today.