XUD 9 oil leak

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Re: XUD 9 oil leak

Post by MikeT »

Leak off pipes can be cut off if replacing.
I did manage to remove (and replace) my injectors using an open ended spanner (and a hammer) but had the mind to soak their threads in plusgas for a few days prior. Expect a fight if you try this approach - better to just buy the special injectors sockets.
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Re: XUD 9 oil leak

Post by boxerbean »

Yeah Mike, I bought a Halfords advance 27mm deep socket, (fits over the leak-off connection) and I gave the threads a squirt of brake cleaner, took an almighty tug to release them.

Does anybody know of a good online source for the head gasket, bolts and fire seals and copper washers?

Cheers.
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Re: XUD 9 oil leak

Post by MikeT »

I bought new injector seals from Citroen as at the time they were reasonably priced.
The head bolts and HG kit I bought was off ebay but as I went for a "repair" MLS gasket without actually measuring the thickness required, meant it was likely down a touch on compression but still started and ran great, especially when tuned.
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Re: XUD 9 oil leak

Post by white exec »

Old HG should have a number of notches in one edge - 1, 2 or 3. These signify the gasket thickness, selectable to compensate for heads which have been machined down. If your head is only to be lightly skimmed (cleaned up), then fit a new HG with the same number of notches.

Before refitting the head, carefully clean up the top face of the engine block. Put some wet tissue or cloth in each pot to help catch dirt, and stop it getting down on to the piston rings. You can very lightly use a fine flat file to help remove dirt on the block face, but do not remove any metal - just dirt. Finish off with a thorough cleaning with petrol or solvent. Wipe the cylinder head face clean too, and fit the guide tube, HG, and head. Do not use any gasket compound on the new HG - assemble dry. Follow Haynes to the letter for tightening down.

Injectors can be refitted after the head is bolted down - easier to torque down. (Injector apertures can be plugged with clean tissue to prevent anything getting dropped in during handling.). Make sure the small fire washers are correctly positioned and the right way up.
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Re: XUD 9 oil leak

Post by boxerbean »

Went for the head this morning, when I had a good look at it I noticed small cracks in the steel inserts the injectors sit in and the skim has left some light scratches in the surface of the head, I'd expect some tooling marks but not to be able to feel them.?The engineer gave it a light rub with a scotch bright pad and , although still visible, can't feel them anymore...

A mechanic rolled up while I was at the shop and said these engines are known for cracking in that area and for pressurising the coolant. AFAIK there was no issue with that prior to removing the head.

Gasket was a two notch one (2 at top right with 3 beneath) engineer thinks the head has been skimmed before so I should get the thickest I can?

Here's a pic of the cracks and the machining, do I plonk the head back on or look for another?
20180505_133340.jpg
Hope you're all having a good bank holiday weekend!
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Re: XUD 9 oil leak

Post by CitroJim »

Those little cracks in the pre-chambers - the steel bits - are nothing to worry about and will not cause any issues...

They are so common as to be considered normal on an engine of that age/mileage...

Go ahead an reassemble ;)

You have no worries that they'll cause any coolant pressurisation...
Jim

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Re: XUD 9 oil leak

Post by boxerbean »

At the risk of going on...

Cleaned up the surface of the block with a razor, piston protrusion is 0.7mm which according to the Haynes corresponds to the two notch gasket that was already on.

The head had previously been skimmed according to the engineer and is now past the minimum dimples... I've checked the depth of the valves and the inlet valves are 0.35mm at their minimum clearance, the exhaust valves pass a 0.85mm feeler just...

I was planning on putting a five notch 1.54 elring MLS gasket on. Will I get away with those clearances?

Also there some deep pitting on the block where the gasket had failed, any remedy to help seal this?
20180506_165435.jpg
20180506_165458.jpg
Ta.
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Re: XUD 9 oil leak

Post by boxerbean »

In the process of putting it all back together and managed to break the pipes off the fuel preheater, does anyone have a part number/source for a replacement?
20180429_165756.jpg

Would I be able to bypass it as a temporary fix?
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Re: XUD 9 oil leak

Post by CitroJim »

You can happily bypass it for good in the UK... It's hardly necessary in our benign climate...
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Re: XUD 9 oil leak

Post by boxerbean »

Ta Jim.
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Re: XUD 9 oil leak

Post by boxerbean »

It lives!
20180513_203118.jpg
Thanks to everyone who answered my daft questions.
More to follow.... 😂😁
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Re: XUD 9 oil leak

Post by white exec »

Daft questions (no such thing, anyway!) are usually the best.
Look forward to the ongoing reports...
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Re: XUD 9 oil leak

Post by CitroJim »

boxerbean wrote: 13 May 2018, 20:33 It lives!


Fantastic :D Well done =D>

I am delighted 8-)
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Re: XUD 9 oil leak

Post by boxerbean »

A couple of questions...Are there any things to watch for after a head gasket change? I've done my best to avoid air locks in the coolant system and what coolant is best for these engines? I filled it with water but that needs drained and replaced...
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Re: XUD 9 oil leak

Post by white exec »

Choose a good quality coolant, and stick to it, for all topping up, etc. Do NOT mix brands, types, etc., and colour means nothing - no agreement between manufacturers.

I wouldn't bother with OAT (organic acid 'long life' types), which must NOT mix with standard (glycol) types.

Personal recommendation (others will have theirs) is Peugeot-Citroen's own 'PRO' brand, ready-mixed, 5-litre.

If you've filled with tapwater, drain it all out, and flush through with distilled/de-ionised/demineralised water before filling with coolant. Important to get rid of the last of the tapwater, to avoid calc problems. If some of the distilled water remains, it's not detrimental.

Be sure to bleed all air out of the system really thoroughly. That avoids hot-spots forming in the head. Check the level daily for a week or so.
_________

Well done in tackling that job, and being so meticulous as you went. Wonder what other challenging jobs we can talk you into...? :roll:
Chris
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