My Engine

[white exec]

Always good to have a well-equipped Dad around!

When you come to run up the engine, make sure you bleed the cooling system really thoroughly, to get rid of every bit of air. The XUD is a long-lived and tough lump, but air pockets in the cylinder head can cause local overheating, and consequent head warping and HG failure.

The expansion/header tank should ideally be the highest point in the cooling system, so air can migrate there.

To bleed the system, bring the engine up to full working temperature, opening each of the bleed screws in turn several times. Run at full temperature for a further 10-15 minutes, until no more air emerges from the bleed points. Worth the effort.

[XUD Marine]

Hopefully the header tank is high enough. You can see the bottom of the tank is about in line with the top of the stat housing, with most of it above the head, being tilted inline with the prop shaft will bring it a little higher. Don't know if the upright position will affect bleeding.
In these latest pics I have the silicone elbows stuck in place temorarily. They will be cut down to sensible lengths and clipped on with copper pipes joining the gaps, when my hose clips arrive, they were posted this morning.
Also mounted the strainer at the beginning of the salt water circuit.
Just going into town to get a new oil filter and the fluids.

Those give an idea of the coolant/seawater paths.

[white exec]

Plenty high enough!
Looking an impressive piece of work.

[XUD Marine]

Yes, it should look quite smart when it's all piped up. Running with the blue and black theme I will probably paint the copper pipes black.

The oil cooler is now fitted. I got my new bolt:-

It has a square nut on it, starting out as a square bit of brass, but worked pefectly.

That threaded tube in the engine took some moving.
Between the wooden crate it's stood on, the starter, alternator and fuel pump, there is enough room to get the stilsons on the grub, but bareley any room to move them anywhere. I got a bite on it under the stater, but it wouldn't budge.
I ended up lifting it off the crate with the hydraulic hoist so I could get to it from underneath with a good quarter turn. It took some slackening but came out with a good pull on the stilsons.
The next inconvenience was the cooler clashing with the alternator/front mount, so I had to take the grinder to that.

I don't like to do that, but a necessary evil.

And it's on, with a nice new filter. Thought there may be just enough blue paint for it but no, it's half sprayed. Should have got some while at the motor spares shop but didn't. Though I do now have oil, antifreeze and ATF waiting in the shed ready to go in.

[XUD Marine]

Just a quick question. I think I already know the answer but want to confirm.

The hole marked in the picture, a while back I noticed it weeping oil, but at first thought nothing of it.
But in this old pre-paint picture the oily marks show something was bolted to the head on the camshaft end.
Looking at Haynes it looks like it would have been a Brake Vacuum Pump and that big hole in the middle was an oil channel for it.
So I guess if the engine runs, oil will gush out there. So I need to plug it with a suitable screw to make a seal.
Is this correct?

[white exec]

Depends what car that engine came from. Do we know?
What was bolted on there?

On BX, the end of the camshaft would have carried a pulley to drive the HP hydraulic pump below. No oil feed needed in this case.
Yes - maybe brake servo on another car, requiring oil feed.
In Haynes, the engine cross-section shows what looks like a horizontal oil gallery at that point, but a bit unclear.
Someone here will know.
Might be a potential take-off point for an oil pressure gauge?

[XUD Marine]

Depends what car that engine came from. Do we know?

Still have not established that.
I'm guessing it was a Peugeot vehicle as the Ebay listing mentioned Peugeot not Citroen. I did not bid for it myself, so don't have a record in my purchase history or emails. I had viewed the listing and did find it in my browser history. I was going to contact the seller and ask them, but by the time I had that idea, the listing page has gone to the land of 404.

The Haynes I have is for the Citroen engine, the same thing I know, but all the references to vehicles are Citroen models. There is a secton on Brake Vacuum Pump (C15 Van)

1. For the period from December 1989 to January 1991, C15 Vans were fitted with a vane-type brake vacuum pump, driven directly from the rear of the camshaft. This modification resulted in a modified cylinder head, incorporating mounting bolt holes for the pump, and an oil channel that passes oil from the lubrication system to the pump. The end of the (shorter) camshaft also incorporates a slot for the engagement with the pump drive dog.

That sounds exactly like what I see in that photo. By "oily marks" I actually mean the clean marks between the oily muck, evidence of something bolted on via the three smaller surrounding holes, plus the slot in the camshaft end fits the desription.
There are also photos in the manual of the pump being removed which seem to tally with the oil marks.
It goes on to say from Jan '91 to early '93 they had the longer camshaft with a pulley drive brake pump.
Then from early '93 on the XUD7 an improved version of the direct-drive vane-type pump with the same mods to the head (holes mentioned earlier).
The photos show two "O" rings, one around the oil hole and a bigger one round the camshaft end.
Does that mean I will have to seal the end of the camshaft too?

[white exec]

That explains everything.
My Haynes Citroen diesel engine book is dated 1990, and is 2nd Edition. You probably have a later one, so it covers those C15 details.

Cit Parts has this for the C15...

Shows Brake Vacuum Pump for Diesel & XUD, for RP5651 (29 Apr 1992) onwards.
Note the two O-rings - which amazingly are still available - and their sizes.
Confirms that the camshaft end needs closing off, as well as the oil supply port.

Hope helpful.

[XUD Marine]

My Haynes Citroen diesel engine book is dated 1990, and is 2nd Edition. You probably have a later one, so it covers those C15 details.

The book I have is 84 to 96 (A to N reg).

Confirms that the camshaft end needs closing off, as well as the oil supply port.

The drawing corresponds with the description and photos in the book and the marks on the head.
Just bunging the hole would be easy enough, being threaded a screw with PTFE would do it. But sealing the camshaft end may be a bit trickier.
I will have to have a closer look when i get back to it at the weekend.

[white exec]

Although the oil gallery would almost certainly be under full engine oil pressure, but easily plugged, as you say . . . the camshaft end might not be at full pressure, but either splash-lubricated, or with its end bearing being drilling-fed, but not inherently a 'gusher'. Closing it off might be just a matter of preventing seepage, rather than holding back 40-70psi. Needs looking at closely.

Oil escaping from the camshaft end bearing will be designed to simply escape into the valvegear (rocker cover) area, thence back to the sump. This escape route is not under pressure, so all that is needed (I guess) is to prevent it leaking outwards from the bearing.

[moizeau]

Could you get hold of a vacuum pump and fit it, just not use it?
Without seeing it in the flesh, another idea may be to fit a 'joint spy' (sorry I can't remember the word in English), like a motorbike fork seal. There seams to be a recess, it just depends on the condition of the recess and cam end.

[Little Grebe]

Hello, sorry I have not had any input recently.

The boat looks like an interesting project.
My oil cooler is as been illustrated (pancake type) I have some photos but need to find out how to attach them to this site.
The supply runs from the bottom of the thermostat housing (your photo shows it blanked off, to the filter and then to the water pump manifold.

Hopefully photos will follow.

[xantia_v6]

There is a fairly simple guide to posting photo's here: viewtopic.php?t=56795

[Little Grebe]

Thank you

[Little Grebe]

Instrument Panel