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cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

1990 Defender 110 200 Tdi SW Santorini Black

TDI 200 Year 1991 Oil Cooler Pipe

Hello everyone,

I need some help or opinions again.

When I changed my engine oil on June 2023, my intention was to also replace the oil filter housing gasket. However, I wasn't able to get it done at the time. Instead, I opened the waxstat adaptor and changed the O-ring, among other things.

After screwing back the oil cooler pipe (as shown in the picture), I noticed leaks starting to appear. Fortunately, I recently noticed the leaks becoming very obvious when the engine is running, and I estimate that about 800ml to 1L of engine oil has been lost.

As a response, I unscrewed the oil cooler pipe and applied white tape. This has improved the situation compared to before, but there is still a very minor leak, and I'm uncertain about how long this temporary fix will hold.

Do any of you have an idea about this? Should I consider changing to a new oil cooler pipe? Or is it possible to unscrew it and re-fit it properly again?

I think overtighten that time and caused the leaks Crying or Very sad

Thank you so much for your assistance!

Click image to enlarge

17th Aug 2023 2:47pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3421

2012 Defender 90 Puma 2.2 CSW Santorini Black

I think I have a spare set of oil cooler pipes, will have to check how the seal is in the engine side. I am very sure its a taper seal in the radiator side. But memory is a bit hazy on how the sealing is on the engine side. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

17th Aug 2023 3:24pm

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

Oh I see, Do you still intend to use it? It also has a taper seal on the engine side, but I believe it doesn't come with an O-ring (as earlier models don't have O-ring, correct?).

17th Aug 2023 3:38pm

Mo Murphy

Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2244

1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey

Correct. Very late 200 tdi had o rings but most are taper.
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey

17th Aug 2023 5:59pm

NickMc

Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1628

Have you got the pipe support clip fitted? I would try some loctite thread sealer like 561 or 545 instead of ptfe tape, check locally though as what suits.

17th Aug 2023 6:54pm

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

Mo Murphy wrote:
Correct. Very late 200 tdi had o rings but most are taper.
Mo

Yes, I think mine don't have the O-ring.

18th Aug 2023 6:36am

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

NickMc wrote:
Have you got the pipe support clip fitted? I would try some loctite thread sealer like 561 or 545 instead of ptfe tape, check locally though as what suits.

No, so must have the pipe support clip? I think have to change a new pipe for better solution.

and thanks for your recommendation - loctite thread sealer, able to buy it here.

thank you.

18th Aug 2023 6:37am

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

Dear all,

Update:

I noticed there is a leak even after I opened it and refitted it using PTFE tape. It appears that I really need to replace the oil cooler pipe for a better solution.

One more notice:

Does anyone know what this thing is (circled in red)? I also noticed some leaks at the bottom (circled in blue). Is there any gasket there? Please refer to the attached picture.

Click image to enlarge

thank you.

2nd Sep 2023 1:01pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3421

That is the brake vacuum pump. Yes, there is normally a gasket underneath it. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

2nd Sep 2023 2:39pm

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

Alright, if I open it, will any fluids like brake fluid come out? Because I've noticed that the leak underneath is engine oil.

Thank you Dinnu

3rd Sep 2023 3:45am

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3421

No, no brake fluid. Just undo the 3 hex head bolts, and lift up. If now remember correctly there may be 2 gaskets, as the bracket for the throttle linkage is sandwiched between the vacuum pump and the engine block. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

3rd Sep 2023 3:52am

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

Ok Dinnu.

As picture below, right?

Can I DIY the engine block gasket using a paper gasket?

Appreciated your helps!

3rd Sep 2023 4:47am

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3421

Yes and yes. I like to use fibre type of gasket when I need a diy approach. For this application, thickness is not so critical, but do not go too thick as would ‘warp’ the vacuum pump.
For extra measure, I do sometimes smear a small amount of RTV on both sides of the gasket. It also helps to locate the gasket, especially in this case as is a bit fiddly to align the bottom gasket, the throttle bracket, the top gasket and finally the vacuum pump, which shaft need to be in the correct position for the drive to engage all at the same time. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

3rd Sep 2023 5:05am

cykoh85

Member Since: 25 Apr 2022
Location: Selangor
Posts: 143

Thank you, Dinnu. The information you provided is very knowledgeable. Well done.

3rd Sep 2023 1:22pm

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