Mondeo 2.5T - won't start after replacing Alternator Belt
Discussion
My Mondeo 2.5T cut out suddenly a few days ago. Managed to get to the side of the road and called Green Flag. He spotted that the alternator drive belt had disintegrated and towed me home.
I've now replaced the drive belt, but the car won't start. I've charged the battery and it makes a noise similar to turning over, but it's not quite right. At this point I don't know whether the drive belt snapped and took something else out at the same time, or something drastic went wrong (e.g. seized engine) which then caused the drive belt to snap.
Any ideas on where to look?
I've now replaced the drive belt, but the car won't start. I've charged the battery and it makes a noise similar to turning over, but it's not quite right. At this point I don't know whether the drive belt snapped and took something else out at the same time, or something drastic went wrong (e.g. seized engine) which then caused the drive belt to snap.
Any ideas on where to look?
Does the car have a crank sensor or similar? Could it be contaminate or broken?
Unscrew the oil cap and have someone crank the engine over. Can you see the cams moving? If so the belt hasn't snapped, doesn't rule out it having slipped a tooth and timing being out mind.
Post a video of it cranking over?
Unscrew the oil cap and have someone crank the engine over. Can you see the cams moving? If so the belt hasn't snapped, doesn't rule out it having slipped a tooth and timing being out mind.
Post a video of it cranking over?
meb90 said:
Fellow Mondeo 2.5t owner here 
I might be wrong, and I hope so, but I feel sure I've read that on these engines if the auxiliary belt goes it takes the cam belt with it. Might explain the cutting out.
Also fellow Mondeo 2.5T owner (must be a sizeable % of them here now I might be wrong, and I hope so, but I feel sure I've read that on these engines if the auxiliary belt goes it takes the cam belt with it. Might explain the cutting out.
)I've also heard the same. eg
passionford.com said:
A lot of the failures on ST timing belts are down to the aux belts snapping and taking out the timing belt.
It was one of the reasons I had my belts done early.Fastdruid said:
meb90 said:
Fellow Mondeo 2.5t owner here
I might be wrong, and I hope so, but I feel sure I've read that on these engines if the auxiliary belt goes it takes the cam belt with it. Might explain the cutting out.
Also fellow Mondeo 2.5T owner (must be a sizeable % of them here now I might be wrong, and I hope so, but I feel sure I've read that on these engines if the auxiliary belt goes it takes the cam belt with it. Might explain the cutting out.
)I've also heard the same. eg
passionford.com said:
A lot of the failures on ST timing belts are down to the aux belts snapping and taking out the timing belt.
It was one of the reasons I had my belts done early.Fastdruid said:
meb90 said:
Fellow Mondeo 2.5t owner here
I might be wrong, and I hope so, but I feel sure I've read that on these engines if the auxiliary belt goes it takes the cam belt with it. Might explain the cutting out.
Also fellow Mondeo 2.5T owner (must be a sizeable % of them here now I might be wrong, and I hope so, but I feel sure I've read that on these engines if the auxiliary belt goes it takes the cam belt with it. Might explain the cutting out.
)I've also heard the same. eg
passionford.com said:
A lot of the failures on ST timing belts are down to the aux belts snapping and taking out the timing belt.
It was one of the reasons I had my belts done early.I think the recommended interval is 10 years or 125,000 miles. Mine is on 156,000 miles (57 plate) and although I have no record of them done, I think they probably have been. Having said that, its not far off being due a service, so I think I'll get the auxiliary belts done soon.
Rockape said:
Whip the two pieces of the black plastic cover of the top the engine. Eight I think torx bolts and you'll be able to see the cambelt.
Done this (thanks for the tip) and cambelt appears to be intact.Next step is to re-charge the battery, then I'll take a video of it turning over.
Many thanks for all the tips so far.
eltax91 said:
Post a video of it cranking over?
I THINK I've done this right. Car now has a new battery.https://youtu.be/ju7m3EHj3Qc
That doesn't have the normal lumpiness of an engine turning over against compression. You said the cam belt looked intact but did you check the cam is actually turning and opening the valves? I can't see in the oil filler on the vid and maybe it's obstructed by a baffle plate, but if you can see the valve train working there it would let you rule out a lot of unknowns.
Well the cams are obviously turning. Not sure if it's plausible or not for it to have jumped a few teeth.
If it's not the cam belt I'd think most likely it's managed to damage something down low, a sensor or some wiring.
Have you got an OBD reader? Is it throwing up any errors?
They're only £5-10 so no real excuse not to these days IMO.
If it's not the cam belt I'd think most likely it's managed to damage something down low, a sensor or some wiring.
Have you got an OBD reader? Is it throwing up any errors?
They're only £5-10 so no real excuse not to these days IMO.
GreenV8S said:
You said the cam belt looked intact but did you check the cam is actually turning and opening the valves? I can't see in the oil filler on the vid and maybe it's obstructed by a baffle plate, but if you can see the valve train working there it would let you rule out a lot of unknowns.
You can barely see in the oil filler on these. I can just make out a camshaft on mine but little else.It does come off though (you can see one of the bolts in the vid) so might be worth taking the plastic cover off the top of the engine along with the filler spout and taking a look inside.
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