First problem in new old car.
Author
Discussion

crankedup

Original Poster:

25,764 posts

272 months

Wednesday 7th June 2017
quotequote all
To be expected I suppose, three weeks into my ownership and my humber refuses to turn over on the starter. Check battery is fully charged and my glass tube meter tells me it is. Check connections and find one on the starter body is a little loose, tightened. Try a jump lead start off my day runner, nothing on my starter motor at all, then see smoke rising from the engine bay of the old girl!! Disconnect quick, it's the earth strap lead smoking. Booked in with garage that works on vintage cars for Monday coming.
Could be starter motor jammed perhaps but garage will check out wiring just in case.
Currently haven't the time to try and fix myself.

john2443

6,540 posts

240 months

Wednesday 7th June 2017
quotequote all
Is starter jammed engaged? Put it in gear, handbrake off and rock it?

friederich

266 posts

215 months

Wednesday 7th June 2017
quotequote all
I'm pretty sure these things have a 'Dynastart' - a combined starter/dynamo that's driven from the front of the engine via a morse chain. It's permanently engaged, and to get sufficient torque for starting, the ratio is such that the thing spins at maybe 2 times engine speed.

As a consequence they can have problems - a bit of heat and 'cruising' at >2000rpm and the old insulation on the windings can fail.

Just a thought, and good luck!

crankedup

Original Poster:

25,764 posts

272 months

Wednesday 7th June 2017
quotequote all
I thought it was a jammed starter motor, certainly the same symptoms, checked it out and not jammed. Plenty of smoke off the earth cable which is now fairly fried.
My old Morris Bullnose had a dynostart, very nice when working well. The Humber is a straight forward starter motor.
I will post again when the issue has been properly investigated and rectified.

john2443

6,540 posts

240 months

Thursday 8th June 2017
quotequote all
Is starter jammed engaged? Put it in gear, handbrake off and rock it?

crankedup

Original Poster:

25,764 posts

272 months

Friday 9th June 2017
quotequote all
Starter motor burnt out, now in for refurb' . Meanwhile I will have to try and get the old girl started on the handle.

littleredrooster

6,358 posts

225 months

Saturday 10th June 2017
quotequote all
crankedup said:
Try a jump lead start off my day runner
Are they both the same voltage, then? I'm just guessing the Humber may be 6v...

crankedup

Original Poster:

25,764 posts

272 months

Saturday 10th June 2017
quotequote all
littleredrooster said:
crankedup said:
Try a jump lead start off my day runner
Are they both the same voltage, then? I'm just guessing the Humber may be 6v...
Yes the Humber is 12v, although many marques in the early motoring days were 6v.

Gary C

15,219 posts

208 months

Saturday 10th June 2017
quotequote all
crankedup said:
littleredrooster said:
crankedup said:
Try a jump lead start off my day runner
Are they both the same voltage, then? I'm just guessing the Humber may be 6v...
Yes the Humber is 12v, although many marques in the early motoring days were 6v.
And some were positive earth.

littleredrooster

6,358 posts

225 months

Saturday 10th June 2017
quotequote all
Gary C said:
crankedup said:
littleredrooster said:
crankedup said:
Try a jump lead start off my day runner
Are they both the same voltage, then? I'm just guessing the Humber may be 6v...
Yes the Humber is 12v, although many marques in the early motoring days were 6v.
And some were positive earth.
Aye. My first car, a 1947 Ford 10, was both 6v and positive earth as I found out when I fitted an 8-track player... :]