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Hot Start Problems
You guys may already know about this, but I thought I'd share my experience on the matter for those who don't.....
During the very hot weather of last month (remember??), my car would start fine from cold, but after warming up and being left for a minute (e.g: stopping off to pick-up a few tinnies before a bbq), would refuse to start until left to cool down for several minutes...
It turns out that the windings of the starter motor were parting company with the armature. When the motor became hot, the connections became worse still, leading to a lack of starter motor action.
968uk forum, Aug 31, 2004
Hot Start Problem (part 1)
The problem with our starter motors keep cropping up once in a while and mine has been causing that embarrasing problem for a year or 2 now.
I have taken the starter motor off previously and given it a good clean, regrease and repaint.
It did seem to be OK for a while but it now gives me a problem whenever I try to start the engine when it is already warm.
It's difficult to describe the noise but I'll have a go, it's a click, a whine and a very loud metalic sounding clunk or bang.
Anyway something needed doing, so off with the starter motor again and have a proper look.
After much research(mainly on this forum so thanks to the contributors)
there seemed to be 3 possible culprits in my particular case:
All obvious stuff really.
1. I had already previously(a couple of years ago) taken the motor apart
and given it a good clean while also checking the brushes and the internal
2. With regard to the solenoid I came to the logical conclusion that if I need to replace it or am getting a new motor I might as well pull the other one to bits just to have a look inside and see what the problem might be.
3. Considering the pinion shaft bush is now 16 years old it would be a good idea to replace it anyway.
After disconnecting the battery and jacking up the car I took off the
starter motor assembly(selection of 17mm, 13mm and 10mm spanners and sockets)
To remove the bush I removed the plate from the back of the housing(8mm spanner), wound an M12 second taper tap into the bush from the starter motor side and then lightly tapped on the end of the tap which was now protruding from the back of the bush.
If you don't have an M12 tap handy you can use a socket or strong wooden
dowel from the back and tap that to knock out the bush.
Going back to the solenoid, some of the information I found suggested
that the contacts in the solenoid can become burnt and blackened. Which
will cause a resistance to the current and can cause some problems.
The contacts do look 'well used' particularly on one side.
I needed to order at least a new solenoid so got onto an autoelectrician mate and took it for him to have a look at, he confirmed that the bush didn't look too bad and that the bad ones are normally worn into an oval and sometimes into the aluminium housing, he also said that he had seen solenoid contacts looking a lot worse.
He did say that it might be a good idea to replace the pinion.
I'll update the report when I have a result.
Stuart Cookson 22-10-2009
Hot Start Problem (part 2)
After assembling the starter motor and solenoid I took the assembly to my mate at VES(Vehicle Electrical Services) in Stockport and he confirmed it all looked good.
Spent this afternoon installing the new bush, putting the motor and the flywheel shield back on the car.
Here are some pictures of the parts and how I did the job.
When I started the car it immediately just seemed to start 'healthier'. I took it for the drive I had been promising myself and it performed as it always has, effortlessly.
But the problem has been with the starter motor and hot starts so driving it isn't really a test of the starter motor 'hot start problem'. So when I came home instead of getting out of the car and opening the garage with the engine still running I switched it off. The missus happened to turn up at that point with the kids so it was a good opportunity to help them into the house, have a chat for 5 minutes etc. using up a bit of time as if I had stopped at a petrol station, which is when the problem usually reared it's ugly head.
I started the car with no problems. OK good, when I got the car in the garage I switched it off and pottered about a bit, another 5 minutes and tried it again and again it started fine.
Hopefully it will continue to now be clear of the problem. I will of course keep you updated if anything changes.
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