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Spot what's missing!
Posted: Tue Sep 20, 2022 19:48
by Tanz
Changed the cambelt today and was just admiring my handy work when I noticed something was missing.
Correct me if I'm wrong but shouldn't there be a bolt and washer holding the auxiliary pully on?
The last time I removed that pully was 2013 - see below
It looks like it has sheared off. That bolt isn't really under any strain so maybe I over tightened it and cracked it but didn't realise and in time it has fallen off.
I always tighten bolts to the torque specified in the service notes so can't really understand it. I think I have been driving with it like that for a while. Doesn't look like a new break
Question now is what do I do about it
Re: Spot what's missing!
Posted: Tue Sep 20, 2022 20:13
by Lotus-e-Clan
For now, I'd think about asking Lotsa bits if they have a spare oil pump/dizzy assembly, then address the broken bolt off the car.
Or as a stop gap (assuming you need the car whilst waiting for the part), I'd drill and tap for a slightly smaller diameter (hi-ten) threaded bolt and snug it up with some thread lock. Then address the issue after you source a spare assembly? Looks like it hasn't moved for a while since the bolt broke, so it's 'well-on' and therefore a small bolt rescue wouldn't be too scary a prospect.
Re: Spot what's missing!
Posted: Tue Sep 20, 2022 20:49
by Pete Boole
That looks like the original washer that is supposed to have a countersunk screw in it, but the other picture shows a hex-headed bolt and standard washer??
Pete
Re: Spot what's missing!
Posted: Tue Sep 20, 2022 22:15
by Marten
Tanz wrote: ↑Tue Sep 20, 2022 19:48
It looks like it has sheared off. That bolt isn't really under any strain so maybe I over tightened it and cracked it but didn't realise and in time it has fallen off.
or maybe some corrosion under the washer added extra oomph
I always tighten bolts to the torque specified in the service notes so can't really understand it. I think I have been driving with it like that for a while. Doesn't look like a new break
Question now is what do I do about it
Try the easy things first: give it a couple of taps with a punch to see if it willl move and if it does walk it out with a centerpunch tapping around the circumference
Re: Spot what's missing!
Posted: Fri Sep 23, 2022 21:38
by Tanz
I have removed the auxiliary housing and the shaft. Talking to Mike at Lotusbits, he can supply a replacement shaft and pulley. I will have a go at getting the bolt out, but I will still need a pulley. Ive got 2 old cam pulleys. Are they the same as the Auxiliary pulley?
Housing with shaft and oil pump.
Shaft Removed
End of shaft with broken bolt
Damage to pulley key way
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 07:13
by AndyC
Yes, pulley is the same, doesn't matter what angle one it is (104, 107 etc).
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 09:31
by Lotus-e-Clan
Wow. Didn't realise the pulley was that loose!
You were lucky the belt stayed on.
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 10:02
by DavidOliver
With that damage to the pulley I suggest you inspect the Woodruff key and it´s seating in the shaft. Any slight damage and you need a new shaft, no point removing the sheared bolt.
Dave the cog.
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 10:35
by Pete Boole
Could this be at the bottom of your ignition timing issues, or have you already sorted that?
Pete
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 12:25
by bash
Loose nuts only belong on the steering wheel.
Bash
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 20:29
by Tanz
Lotus-e-Clan wrote: ↑Sat Sep 24, 2022 09:31
Wow. Didn't realise the pulley was that loose!
You were lucky the belt stayed on.
The pulley and the key were jammed on and I needed a puller to get the pulley off.
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 20:33
by Tanz
DavidOliver wrote: ↑Sat Sep 24, 2022 10:02
With that damage to the pulley I suggest you inspect the Woodruff key and it´s seating in the shaft. Any slight damage and you need a new shaft, no point removing the sheared bolt.
Dave the cog.
Thats what I have been thinking. The key is damaged and the slot it fits in distorted.
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 20:42
by Tanz
Pete Boole wrote: ↑Sat Sep 24, 2022 10:35
Could this be at the bottom of your ignition timing issues, or have you already sorted that?
Pete
I was thinking the same Pete. I found the cam belt was a bit loose and tightened it back up using a Krikit and that seemed to improve the problem a bit but it didn't fix it completely. Will be interesting to see how it goes after I have replaced the shaft and pulley. I have to say I have been very fortunate not to completely wreck the engine.
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 20:43
by Tanz
bash wrote: ↑Sat Sep 24, 2022 12:25
Loose nuts only belong on the steering wheel.
Bash
Re: Spot what's missing!
Posted: Sat Sep 24, 2022 20:46
by Tanz
Tanz wrote: ↑Sat Sep 24, 2022 20:42
Pete Boole wrote: ↑Sat Sep 24, 2022 10:35
Could this be at the bottom of your ignition timing issues, or have you already sorted that?
Pete
I was thinking the same Pete. I found the cam belt was a bit loose and tightened it back up using a Krikit and that seemed to improve the problem a bit but it didn't fix it completely. The cam belt was probably loose because the pulley had slipped on the shaft. Will be interesting to see how it goes after I have replaced the shaft and pulley. I have to say I have been very fortunate not to completely wreck the engine.