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neilburns

New Member
hi there

right to cut a long story short my 300tdi disco auto half snapped its timing belt about 3 weeks ago and snapped a rocker arm and bent a couple of push rods I have replaced every thing new timing kit new rocker arm full set of new push rods got it to a point of starting tonight there's fuel going thru injectors and everything is timed up but she wont fire any suggestions as to what it could be and I am out of ideas now
 
neilburns said:
hi there

right to cut a long story short my 300tdi disco auto half snapped its timing belt about 3 weeks ago and snapped a rocker arm and bent a couple of push rods I have replaced every thing new timing kit new rocker arm full set of new push rods got it to a point of starting tonight there's fuel going thru injectors and everything is timed up but she wont fire any suggestions as to what it could be and I am out of ideas now
Click to expand...

Checked that the valve clearances are good after the push rods have 'sat down' properly?, some valve caps can move at first turn over ...
 
Hi jamesmartin,

No we didn't slacken the centre nut. We marked the position of the original timing before we started. When we had fitted everything we then slackened the 3 timing nuts and turned the round disc until the holes all lined up on the pulley and injection pump with a 9.5mm drill. The whole thing ended up between 1 and 2mm away from where it was originally set.

We haven't taken the head off but when we replaced the broken rocker we checked all the valves were going up and down ok and the valves clearances to the rockers were all ok so we took that as hopefully meaning the valves weren't damaged.

With the injectors squirting as they are and the engine timed even if a little badly surely it would still run even if badly.
 
When you timed up the pump sprocket,did you have the engine on tdc with pin in flywheel and camshaft on its timing marks?1mm to 2mm different from original sounds like belt is out by a tooth maybe ,assuming original had not snapped completely.
I would time it up again-take your time
 
I think we have but the real difficulty is top dead centre. The flywheel doesn't line up with the drain hole, it's set back towards the gearbox so you can't screw the pin in and lock it. You can just about see the notch in the flywheel so we are aligning that with the hole but can't actually pin it. We were doing it by just getting the timing wheel keyway to what looked like top dead centre, when we get the notch in the flywheel to line up the keyway looks a bit past top dead centre. Anyway we are now having a go with the notch lined up with the drain hole as best we can.
 
neilburns said:
Hi jamesmartin,

No we didn't slacken the centre nut. We marked the position of the original timing before we started. When we had fitted everything we then slackened the 3 timing nuts and turned the round disc until the holes all lined up on the pulley and injection pump with a 9.5mm drill. The whole thing ended up between 1 and 2mm away from where it was originally set.

We haven't taken the head off but when we replaced the broken rocker we checked all the valves were going up and down ok and the valves clearances to the rockers were all ok so we took that as hopefully meaning the valves weren't damaged.

With the injectors squirting as they are and the engine timed even if a little badly surely it would still run even if badly.
Click to expand...
i thought you had no fuel squirting out of injectors ?if you havent have you bled system by slackening front banjo bolt ? lift pumps often fail but the first you know about it is when you interfere with fuel system and let air in inection pump will pull from the tank if system has no air but wont if it has lift pump is needed for that
 
Of all the info I read, there are two timing lines on the flywheel, got the correct one. I just did my timing belt and the kit i bought has a spring loaded pin that screws in, someone closer than me must be able to lend it to you. Try Paddocks. if cant borrow one.
 
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