GU air box gasket

I was working under the bonnet of the GU on the weekend and I noticed a noise from the air box when I started the engine. After removing the lid of the air box I noticed that the gasket around the perimeter of the lid was totally perished and most of it was missing. I went to the local Nissan dealer to get a new one and he said it was not listed - I would have to buy a new lid. I did not even bother to ask for a price (he may have had to call an ambulance!) - and went straight to Rare Spares who had replacement rubber off the roll for $2.00 for a metre.

Good thing to check on your Patrol because if you have a snorkel and think you are safe to do a river crossing - the water will certainly get into the air box via the defective seal.

Its a cheap repair at $2.00.

interesting you should mention it. i noticed water in my airbox the other day after washing the engine bay. this seal appeared to be my issue to. how common is this????

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Originally Posted by scotty83

interesting you should mention it. i noticed water in my airbox the other day after washing the engine bay. this seal appeared to be my issue to. how common is this????

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Would be VERY common. The rubber ages over time, hardens/dries out and falls to bits. I suggest we all check our seals. Its easy to do. Just undo the clips holding the top on the air filter - undo the MAF sensor plug - loosen the clamp and remove the top - look under the lid and you will see the seal located in a square groove. If the seal is hard and brittle - it's knackered and needs to be replaced NOW. Simple and may save you an engine replacement.

Cheers Bill, rare spares, who would of thought of that. Nice work mate and thanks for the tip,


Yappa Tappa Doo

can't believe there isn't a Nissan spare for something in so many vehicles. GO NISSAN...

i raplaced mine a while back and got some from clark rubber make sure you do check it as i almost drowned my car because of it

After replacing mine, I did a seal test and found air still getting in somewhere. It took 6 months but I discovered air was still finding a way through the seal on the lid. I ended up using blue air sensor safe silicone and sealed it up that way.

Since then I've replaced the entire airbox with a high flow stainless steel unit from PatrolDocta. It has a simple rubber ring that does not leak, she also breathes a LOT better.

Looked at my airbox lid yesterday, same problem, gasket breaking up. So good tips on hoe to fix

On eBay

http://www.ebay.com.au/itm/Nissan-Pa...:L:LCA:AU:1123

just purchaced 3 of these 2 for mates
when we checked theirs they were broken and brittle heres a link
http://www.ebay.com.au/itm/121576966...%3AMEBIDX%3AIT

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Originally Posted by my third 256

just purchaced 3 of these 2 for mates
when we checked theirs they were broken and brittle heres a link
http://www.ebay.com.au/itm/121576966...%3AMEBIDX%3AIT

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Be interested in what you think,
Did Mega use some rubber from Clarkes Rubber

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Originally Posted by threedogs

be interested in what you think,
did mega use some rubber from clarkes rubber

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i used clarkes rubber works a treat

Just checked mine - seems ok.

However - a ‘supplementary question’ . :)
Whilst I had the airbox lid off I noticed a small hole in the bottom of the airbox, obviously a drain hole. Drain hole on my old bus had one of those squeezy rubber tubes attached to allow water out, but not in, but this is just a hole with nothing to attach a tube to. Does that sound right or is something missing? I’ve sealed it with a course thread tek bolt & rubber washer (from underneath).

It may be a drain hole for the snorkel , to let water out

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Originally Posted by threedogs

It may be a drain hole for the snorkel , to let water out

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Surely snorkels would have their own drain point somewhere before the airbox itself wouldn’t they? So does your airbox have a drain hole?
The bottom of the airbox has a raised concentric lip which is outsided of the diameter of the filter. the hole is between this lip & the side of the airbox. Looks to me that the design is to allow a certain amount of water in the box without it getting sucked into the motor. However it has the potential to let water in during a deep water crossing. I guess with it blocked off I’ll just need to remember to check for water in the airbox from time to time.

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Originally Posted by cuppa

just checked mine - seems ok.

However - a ‘supplementary question’ . :)
whilst i had the airbox lid off i noticed a small hole in the bottom of the airbox, obviously a drain hole. Drain hole on my old bus had one of those squeezy rubber tubes attached to allow water out, but not in, but this is just a hole with nothing to attach a tube to. Does that sound right or is something missing? I’ve sealed it with a course thread tek bolt & rubber washer (from underneath).

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my air box is the same theres a thread here some place about them sealing it with silicone

Never had a good look inside the air box but driving when its flogging down ,
I'd want to water to be able to drain.I've had the water half way up the windscreen
going to Bearii just after the gate on suttons lane {no snorkel} and no water ingress as well.
most snorkel fitters do some thing to the air box what that is I dont know

If you have a snorkel and you get ANY water in your air box - you have a problem somewhere. Usually it gets in via a poor seal either on the airbox or somewhere on the snokel's plumbing, or the hole in the bottom of the air box (that usually has a rubber valve in the ones I have looked at anyway) has not been sealed.

Or - of course - you were in water which was above the snorkel!

As far as I am aware Bill there is only a hole in the GU boxes. When I worked for Donaldson we sold tonnes of those "Vac Valves". But they were primarily for the larger housings. I thought to block that hole but if any water to get in it would no where to go so I left it.

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Originally Posted by Cuppa

Just checked mine - seems ok.

However - a ‘supplementary question’ . :)
Whilst I had the airbox lid off I noticed a small hole in the bottom of the airbox, obviously a drain hole. Drain hole on my old bus had one of those squeezy rubber tubes attached to allow water out, but not in, but this is just a hole with nothing to attach a tube to. Does that sound right or is something missing? I’ve sealed it with a course thread tek bolt & rubber washer (from underneath).

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I have an 03 3ltre and it has a hole in the air box (maybe 3mm) with no rubber piece or any way to connect anything to it. It is just a hole, and I have no snorkel

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Originally Posted by Paule

I have an 03 3ltre and it has a hole in the air box (maybe 3mm) with no rubber piece or any way to connect anything to it. It is just a hole, and I have no snorkel

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If you have no snorkel the deepest water you should be in is just on wheel height - and even then you should be very careful and check your air box for water when you are on dry land.

I filled my drain hole with sika.. One less potential leak. And when I got my rubber from Clark rubber it was going to cost under a dollar so the fella couldn't be bothered with payment as I only had cards so he gave it to me lol

seal in perfect fit and mates are happy with theirs
only took 2 days to get

So what I want to know is ...... is the drain hole necessary? Is it there for when no snorkel is fitted? I know water shouldn’t get in but Mr Nissan obviously thought a drain hole was a good idea. Where is the air intake situated when no snorkel is fitted?

Thank forum chappies, checked our last night and it's starting to deteriorate and crack.
Ordered one from the net.
Like Cuppa asked, what happens if the drain hole is blocked?
Guess you have to check after rain and deep crossings to be sure.
Any other tips?

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Originally Posted by macca

Thank forum chappies, checked our last night and it's starting to deteriorate and crack.
Ordered one from the net.
Like Cuppa asked, what happens if the drain hole is blocked?
Guess you have to check after rain and deep crossings to be sure.
Any other tips?

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on mine where the air box butts up to the snorkel on the guard moisture can get in there unless you have sealed it with selastic

so ive left the hole open

New one arrived today, the other fell apart when I took it out. Thanks for the lead

Without a snorkel fitted the air intake is from the inner guard. Think of all the dust the wheel stirs up! Any water that flicks up from there and enters the air box is supposed to drain via the hole in the bottom. Makes a snorkel look like a necessity doesn't it?