Hey guys,
I've just had the oil pump jackshaft drive gear (the one that's driven by the timing belt) shear apart, so that the oil pump wasn't spinning for approximately 3-4km. I'm just wondering whether this is a common problem, or maybe some thoughts as to what might have caused it? The gear didn't appear to have any damage when I fitted it.
Also, is there even the slimmest hope that my main/rod bearings, cam lobes, rings, etc. weren't severely damaged by not having an oil pump?
Cheers all.
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Oil Pump Jackshaft Gear Split, Help Please!
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- poeticjustice88
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i cant say that I have seen many cases of this happening on the forum.
you said you fitted it, How long ago?
could you have possibly over tightened it?
did anything get in there, like a stick or rock? I know it sounds weird, but I have seen it happen.
4 km with no oil pressure to the head would have me worried. pull the rocker cover off and see if you can notice any grind that weren't there before.
I would take the chance of driving it until you have a look.
Hope this somewhat helps bud.
Michael
you said you fitted it, How long ago?
could you have possibly over tightened it?
did anything get in there, like a stick or rock? I know it sounds weird, but I have seen it happen.
4 km with no oil pressure to the head would have me worried. pull the rocker cover off and see if you can notice any grind that weren't there before.
I would take the chance of driving it until you have a look.
Hope this somewhat helps bud.
Michael
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I think I see the problem now...
It was fitted around last November, I'd say. It's possible it was overtightened, but it broke on the edge.
Here's a pic -
I think your third suggestion might be bang on - I don't know how I missed those marks, but it looks like a bolt has come loose behind the timing cover and caused the damage. Will investigate some more this afternoon.
Many thanks for the reply, Michael!
Here's a pic -
I think your third suggestion might be bang on - I don't know how I missed those marks, but it looks like a bolt has come loose behind the timing cover and caused the damage. Will investigate some more this afternoon.
Many thanks for the reply, Michael!
- poeticjustice88
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I think you're definitely right there. The timing belt has corresponding marks on it too.
Just pulled the rocker cover off, cam lobes feel a bit dry, but no evidence of really bad wear. I think the top end might be ok in the short term if I drive very easy on it. A bit concerned that it's going to spin a bearing at some point, but that's life.
I'll probably build up a spare motor using a spare crank, rods, pistons, etc. It needed new valve stem seals anyway, probably time for a head service too. Ah well!
Just pulled the rocker cover off, cam lobes feel a bit dry, but no evidence of really bad wear. I think the top end might be ok in the short term if I drive very easy on it. A bit concerned that it's going to spin a bearing at some point, but that's life.
I'll probably build up a spare motor using a spare crank, rods, pistons, etc. It needed new valve stem seals anyway, probably time for a head service too. Ah well!
- tassuperkart
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Unless there is some evil noise in the engine after you repair it, Id say there is little chance of any serious engine damage.
Engines will run a remarkable length of time with no oil at all and Id seriously doubt you lost complete oil pressure.
If the toothed section had completely let go, then the belt would have loosened completely off and there is no way in hell it would have NOT jumped teeth on the cam/crank sprocket and lunched a handful of valves.
Does the pulley show signs of rust on the inside? As in, say, sitting in a box somewhere upside down and gotten water in it?
I cant imagine the belt tension could be gotten so great as to flex the pulley to death where it has let go.............
Id have expected it to let go in that area right around the bolts.
NEVER seen a failure like that...... very strange indeed.
Oracle
Engines will run a remarkable length of time with no oil at all and Id seriously doubt you lost complete oil pressure.
If the toothed section had completely let go, then the belt would have loosened completely off and there is no way in hell it would have NOT jumped teeth on the cam/crank sprocket and lunched a handful of valves.
Does the pulley show signs of rust on the inside? As in, say, sitting in a box somewhere upside down and gotten water in it?
I cant imagine the belt tension could be gotten so great as to flex the pulley to death where it has let go.............
Id have expected it to let go in that area right around the bolts.
NEVER seen a failure like that...... very strange indeed.
Oracle
Forcd4 wrote:Oh fuk no dude it's you a again, the oracle.
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Ah, well this sounds promising! I'll find out next week when the jackshaft seal comes in (pierced it with a screwdriver trying to stop the centre of the pulley from spinning) whether there are any of these evil noises. But the fact that it might actually be ok makes me happy!
The pulley had no signs of rust on the inside that I could see. However, there are a lot of metal shavings inside the timing cover, a worn spot on the plastic on the timing cover just underneath the gear, and a matching mark on the gear on the inside.
Is it possible that a bolt has come loose, gotten jammed in the gear, and the jamming has caused the pulley to shear off?
Thanks, Oracle!
The pulley had no signs of rust on the inside that I could see. However, there are a lot of metal shavings inside the timing cover, a worn spot on the plastic on the timing cover just underneath the gear, and a matching mark on the gear on the inside.
Is it possible that a bolt has come loose, gotten jammed in the gear, and the jamming has caused the pulley to shear off?
Thanks, Oracle!
- panagiwtis N13
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wow! never seen that on a e-series engine or ever heard of any kind of that failure.you were very unlucky! hope the engine is ok.
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Well guys, after slapping it back together, everything appears to be back to normal. I think perhaps the motor has always been a bit tired, as I can hear an occasional and random knock coming from the sump. But that sound is no worse than it was before, and if anything the engine is slightly quieter. Haha!
Thanks for all your help everyone!
Thanks for all your help everyone!