Air Cleaner Dump Valve

[DiscoDave]

I've just got myself a 1986 County with a 4BD1 in it and starting from a position of total ignorance I thought I'd check out the air cleaner and change the filters er.. "elements" if required. While I was there I noticed the rubber dump valve was badly perished and I've been trying to find a replacement.
Scouse tried to help me out but his parts manual shows some complex arrangement of four (expensive) parts making up the valve whereas I just have this rubber 'ducks bum' type of thing.
Can someone tell me what is the correct dump valve to have and where I can get one from?

[incisor]

whats the dia of the pipe it fits on ?

[DiscoDave]

It's about 75mm diameter. Sticks straight down from the air cleaner housing near the end with the removable lid. The rubber bit has PIO-3198 moulded in it.

[isuzubob]

The Donaldson Part # is P103198. Phone your local truck parts mob (Colrain, Truckline etc) for a price. See also Donaldson Accessories Catalogue p 44;)
http://www.odms.net.au/files/organise/donaldsonfilters/product_file_attachment/AustNZ%20Air%20Catalogue%20DD-402.pdf

[C H T]

I've just got myself a 1986 County with a 4BD1 in it and starting from a position of total ignorance I thought I'd check out the air cleaner and change the filters er.. "elements" if required. While I was there I noticed the rubber dump valve was badly perished and I've been trying to find a replacement.
Scouse tried to help me out but his parts manual shows some complex arrangement of four (expensive) parts making up the valve whereas I just have this rubber 'ducks bum' type of thing.
Can someone tell me what is the correct dump valve to have and where I can get one from?

Dave

PM me your contact details I have a genuine one that you can have

Christopher

[DiscoDave]

Thanks for the replies everyone. PM sent Chris.
So the one piece rubber valve is the correct type to have on my County. What happens if I want to fit a snorkel? Should I seal off the dump valve opening or is one in good condition waterproof?

[JDNSW]

Thanks for the replies everyone. PM sent Chris.
So the one piece rubber valve is the correct type to have on my County. What happens if I want to fit a snorkel? Should I seal off the dump valve opening or is one in good condition waterproof?

Waterproof is not exactly the term I would use - they are a one way valve. You will find a similar gadget below the water line on the transom of many sailing dinghies. It allows movement of fluids (air or water) only in one direction (out) being open when the pressure is greater inside the aircleaner and shut when the pressure is lower than outside. Using this principle the pulsations in pressure from the intake manifold eject any accumulation of dust on the bottom of the air cleaner housing - this is why you should not remove it even if you are using a snorkel.

If you are in deep water, the pressure outside the dump valve will be much higher than the pressure inside, so no water will enter.

The summary is simply that for deep wading, the dump valve needs to be in good condition - but the same applies to every joint in the intake system, plus of course to your engine breather (presumably redirected up the snorkel along with the transmission and axle breathers and other "sealed" points such as the breathers on the hydraulic and PS reservoirs.

John

[Red Rocket]

Isuzubob, I don't think you have the correct part number there.
The 4BD1 has a special "Pulsator" air cleaner and the valve is harder than the standard 3"
I'll see if I can find the right number. It is best to quote the part number of the aircleaner to get the correct valve. The standard ones go to pieces very quickly. However, they will last on a turbo as it takes out the pulsations.
Red Rocket.

[EchiDna]

mine had a Vegemite jar lid on it when I got it! :)

[clean32]

Watching

[DiscoDave]

Isuzubob, I don't think you have the correct part number there.
The 4BD1 has a special "Pulsator" air cleaner and the valve is harder than the standard 3"
I'll see if I can find the right number. It is best to quote the part number of the aircleaner to get the correct valve. The standard ones go to pieces very quickly. However, they will last on a turbo as it takes out the pulsations.
Red Rocket.

In the Donaldson catalogue that Isuzubob posted they list a harder valve as an option, which is part number P105220. Is that the one I should be fitting for a normally apirated 4BD1?

[C H T]

Dave

Genuine Landrover Australia supplied dump valve is in the post to you - I had to remove the dump spigot on my aircleaner in aorder to fit it to the Turbo Isuzu

Christopher

[DiscoDave]

Genuine Landrover Australia supplied dump valve is in the post to you - I had to remove the dump spigot on my aircleaner in aorder to fit it to the Turbo Isuzu

Many thanks Christopher. :) Please PM or email your bank details so I can reimburse you for postage.

[Red Rocket]

The correct part number for the Vacuator ( dump valve) is P106593.

Red Rocket.

[DiscoDave]

Ah, that's the higher durometer version of a second 76mm Vacuator valve listed in the Donaldson catalogue. I couldn't see what the difference was between the two 76mm versions they list and in the photo they look almost identical. Can anyone enlighten me?

[isuzubob]

Isuzubob, I don't think you have the correct part number there.

I'm just quoting from an early (September 1983!) JRA One Ten parts catalogue

[DiscoDave]

I fitted the new dump valve that Christopher sent me (P103198) last Monday (still waiting for that PM Christopher! :)) and also adjusted the rear brake shoes, as the brakes were becoming less and less effective, and haven't driven it since other than a quick test of the brakes which were much better. I drove The Red Beast to Lithgow this morning for a bit of Xmas shopping and realised I wasn't needing to change down for every bit of hill as I used to have to! I drove the whole way in 4th and although it does slow down on the rises it doesn't die the way it used to. :cool: