Citroen XM Forum

Crank spins OK, Pump spins OK (and pumps fuel), crank turns OK with cam box off, flywheel pin double checked)

Just done a quick check on Parts for the 2.1, and there are two timing belt lengths listed
0816 54 - 149 DTS (teeth) - for XUD11BTE & ATE
0816 53 - 144 DTS - for earlier 2.1td

??....can I turn the Cam Shaft with the engine locked at the crank ?....will the pistons touch the valves or are the all clear at the locked position ?

The belt is for the XUD11BTE & ATE and matches the one that came off....once I got the tensioner correct it slipped on fine.

Stickfinger wrote: Wed Feb 17, 2021 2:58 pm 20210217_141724.jpg

Referring to this pic I still reckon the crank timing is too advanced..

My other thought was is.. Was the locking bolt in the tdc hole or in the flex plate gap...

Stickfinger wrote: Wed Feb 17, 2021 5:09 pm ??....can I turn the Cam Shaft with the engine locked at the crank ?....will the pistons touch the valves or are the all clear at the locked position ?

The belt is for the XUD11BTE & ATE and matches the one that came off....once I got the tensioner correct it slipped on fine.

No valves will touch the pistons but as you are. Turning by hand you won't hurt them.

citroenxm wrote: Wed Feb 17, 2021 5:13 pm

Stickfinger wrote: Wed Feb 17, 2021 2:58 pm 20210217_141724.jpg

Referring to this pic I still reckon the crank timing is too advanced..

My other thought was is.. Was the locking bolt in the tdc hole or in the flex plate gap...

Stuck a 6mm hex key in the hole, turned crank until it slipped in and the crank locked......are you telling me there are TWO holes close together ?
(the pin went in about 2 or 3cm)

The crank does appear too advanced in your picture, it should look like the below image when pinned. Each tooth is ~17 degrees rotation, so possible to cause valve contact.

Link for large size, high res, image.
https://i.imgur.com/RYK3uhE.jpg



Also check you have the cam sprocket on the right way round. With cylinder number one "on the rock" (flywheel end), number four (belt end) should have the cam lobes on compression.
You can rotate the camshaft IF you lower the pistons to the centre of the stoke...i.e. turn the crankshaft 90 degrees from TDC.

There should only be one pinning hole in the flywheel.

You might need to undo the starter motor retainers to gain better access to the pinning hole in the block.
Remove the belt, unlock the flywheel, rotate the crank backwards past the pulley keyway markers, bring it forwards and feel the pin go in.
Increase your pin size for accuracy...8mm comes to mind.

A sure fire way to check the crank position is to remove the sump and take a look.

White Exec wrote: Wed Feb 17, 2021 5:05 pm Just done a quick check on Parts for the 2.1, and there are two timing belts lengths listed
0816 54 149 DTS (teeth) - for XUD11BTE & ATE
0816 53 144 DTS - for earlier 2.1td

Stickfinger wrote: Wed Feb 17, 2021 5:09 pm ??....can I turn the Cam Shaft with the engine locked at the crank ?....will the pistons touch the valves or are the all clear at the locked position ?

The belt is for the XUD11BTE & ATE and matches the one that came off....once I got the tensioner correct it slipped on fine.

AFAIK, There has never been another belt other than 149T for 2.1TD. My mandarin car had engine no. 660, so pretty early in production and it is definitely 149T.

I think the 144T must be for the 1.9 litre.

I will remove the cam box again and spin the engine and try to re-pin it.

There are two things I cannot understand/would like to know:

1. The pin was a positive slide in...a highly qualified mechanic checked it for me and re-inserted it, deffo a positive slide in and lock......
?? Is their only ONE hole in the flywheel ??

2. 8mm does not fit, 6mm does....again....my friend checked this using long 8mm + 6 mm hex L-wrenches....only the 6mm one fitted. (the 8mm (or 7mm) does not fit through the crank-case hole)

Pauls Photo......my photo (this car)
There is no hole in the crank for a pin to slide in when the woodruf key is at Paul's position....I can see there is a difference in the key position and the casting pattern of the block ......

Had the same difficulty when re-belting XUD9 here: 8mm bolt/rod would not go into the flywheel hole.
Dropped to 7mm, and ok.

Belt lengths
Will, 0816 53 144DTS is listed on Parts for 2138cc XM (XM I).
NFP, but still listed there.
Presumably the 149DTS belt replaced it?