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Super7



Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132
United Kingdom 1999 Defender 90 Td5 CSW Rutland Red
Weeping TD5 is driving me mad!!
I was wondering if anyone has any ideas as to why my TD5 rocker cover gasket is constantly leaking around the half moon..?

I have tried and re-tried all the obvious things and I'm running out of ideas. I'm on my second gasket – the first was OEM and the one I have now is genuine Land Rover. I have removed and re-sealed them both numerous times, firstly using RTV sealant and this time using a Land Rover sealant that they recommend (STC50550). Each time I have been extremely careful removing all traces of the old sealer and thoroughly cleaning and de-greasing.

I thought it could be excessive crankcase pressure but I have also renewed the PCV valve. I have also replaced the rear camshaft seal.

Apart from this the engine runs really well. Its done approximately 85k miles, doesn't use much oil and the coolant level is very constant. I did have a a problem with a severe lack of power and this was due to a gunked up EGR valve but once this was replaced with a removal kit it run perfectly.

It is definitely the half moon, you can feel the oil underneath.

Any ideas would be appreciated! Thumbs Up
Post #369029 2nd Nov 2014 4:02pm
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NickH



Member Since: 01 Nov 2014
Location: Halifax
Posts: 204
England 2003 Defender 90 Td5 PU Rimini Red
Hi

Strange one that,
I have only ever fitted Td5 rocker gaskets dry or with a bit of grease to hold it in place. Sometimes using sealer can act as lubricant for the gasket allowing the half moon to be pushed out by crankcase pressure easier than if it was dry. Dunno if that helps , just my experience. Question
Post #369039 2nd Nov 2014 4:20pm
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Super7



Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132
United Kingdom 1999 Defender 90 Td5 CSW Rutland Red
Thanks for the reply Nick Very Happy

When I first fitted each gasket they were dry the first time. This time I refitted the gasket with sealant yesterday and it has not been run until today so it's had a day to cure.

Dave
Post #369044 2nd Nov 2014 4:30pm
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NickH



Member Since: 01 Nov 2014
Location: Halifax
Posts: 204
England 2003 Defender 90 Td5 PU Rimini Red
Hi Dave

Thats just blown my idea out of the window then Rolling with laughter

If its sealed like you have done then nothing should escape, maybe crankcase pressure needs checking into, usually I would expect more symptoms if the pressure was too high though.

Hairline crack in cover maybe ?

Sorry I cant be more help mate.
Post #369048 2nd Nov 2014 4:37pm
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Super7



Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132
United Kingdom 1999 Defender 90 Td5 CSW Rutland Red
Ha, all ideas appreciated as I'm fast running out of things to try next! Laughing

I did think about replacing the cover now that you mention it. It looks ok though, no dents to marks on the sealing face. Saying that though I've also put sealant on both sides of the gasket, so any slight imperfections on the cover should be sealed.

Bloody thing!! Rolling Eyes
Post #369053 2nd Nov 2014 4:48pm
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rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2222
United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
Have you got the top hat washer/spacer fittings present in all the holes? Are you overtightening the bolts? 02' 110 TD5 Double Cab Rebuild Thread
Post #369070 2nd Nov 2014 5:58pm
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Super7



Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132
United Kingdom 1999 Defender 90 Td5 CSW Rutland Red
Yep, all top hat spacers present - not over tightened just nipped up Thumbs Up
Post #369073 2nd Nov 2014 6:02pm
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Lou Sparts



Member Since: 15 Apr 2012
Location: Kent
Posts: 1501
United Kingdom 2005 Defender 90 Td5 XS CSW Zambezi Silver
Are you sure it's the cam cover gasket ? The fuel pressure regulator is in the same area and is well known to leak and fuel runs down the block picking up crud on the way and drips off the engine black and looking like oil. Just a thought. 2005 Td5 90 XS

Steve
Post #369087 2nd Nov 2014 6:39pm
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Super7



Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132
United Kingdom 1999 Defender 90 Td5 CSW Rutland Red
Hi Lou

Yes I'm pretty sure that's where it's leaking from, underneath the half moon is moist and puddles on the corner of the head / cam carrier join and runs down the block.

I forgot to mention I've also replaced the fuel pressure regulator o rings and that doesn't seem to leak. Thumbs Up
Post #369088 2nd Nov 2014 6:47pm
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Super7



Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132
United Kingdom 1999 Defender 90 Td5 CSW Rutland Red
Thought I’d update the thread..

With the gasket in place I smeared a bit of silicone around the edge of the half moon and it seems to have stopped the leak. Next time I take it apart I’ll make sure this rear corner has enough silicone on it.

Dave
Post #371265 12th Nov 2014 1:52pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1620
Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
Replace the PCV as its probably blocked.
Post #372110 17th Nov 2014 12:20am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5837
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I have the same issue on mine, it weeps. I have tried gen LR gasket, sealant, no sealant, non gen LR gasket and it always leaks at the half moon and also the seal above glow plug area.

Where is the PCV thing you refer to? I have tried blowing into the rocker breather and that appears fine 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #372171 17th Nov 2014 1:20pm
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Super7



Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132
United Kingdom 1999 Defender 90 Td5 CSW Rutland Red
The PCV valve is the plastic thing connected to the breather hose on the rocker cover. I replaced mine and it didn't make any difference (to the weeping) although some people say it should be a service item. They're quite cheap so it might be an idea to replace it anyway if you've tried everything else.

To stop mine leaking I put a bit of silicone on my finger and wiped it around the edge of the half moon. Next time I take the rocker cover off I'll clean it up and do it properly.

Dave
Post #372236 17th Nov 2014 6:14pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1620
Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
double post

Last edited by NickMc on 17th Nov 2014 10:53pm. Edited 1 time in total
Post #372356 17th Nov 2014 10:51pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1620
Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
How many miles are on the engine? Are the bolts and spacer/washers in good condition?
Post #372358 17th Nov 2014 10:53pm
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