charliecambs
Member
- Messages
- 70
- Location
- cambridgeshire
Not actually my project - just helping out!
Neighbour has completed restoration of a Mk2 Jag. Bodywork etc all repainted and buffed, engine rebuild with new mains and rings. It certainly looks the part ( there's also a nice set of "chrome plated" powder coated wheels to go on).
As a retired electronics engineer i've helped out with a few electrical issues and he is looking at swap to negative earth and alternator at some point but dynamo does charge ok.
Due to the current situation this year its been maybe 3-4 miles.
He noticed on recent start up that it was very "stiff" to crank and start but once its turned over it starts and will restart easier.
I popped over and checked battery with my old school drop tester and it held 9 volts or more getting the load to glow red so battery ( 12.4 volts pre-test) seems OK
Trying first start from cold the motor engaged but sat for split second before engine started to turn but then started fairly quickly.
Crank voltage from DVM was more than 9 once it turned difficult to measure of course .( my DC clamp meter is 100A max so didn't try that)
Main earth from battery to scuttle is clean, earth from other side of engine bay scuttle to engine bell housing looks clean. The drop from battery earth (+) to cam-box on cranking over after starting first time was about 0.4 volts but didn't reduce much when we used a jump lead from batt + to bell housing.
Its a newish bendix type starter and he's currently bidding on a new extra high torque one ( not cheap!). He reckons motor bell-housing faces were clean and there's the bolts too.
I'm thinking that new mains and cold 20/50 probably isn't helping and suggested a separate earth wire to starter bolts and maybe try next time cold using a jump battery too ( i'll probably repeat measurements) cant do any harm.
He was reckoning that getting the starter reconditioned he may as well fit (if he wins it) the high torque one as oil filter has to come off to remove as well.
Apologies for long post but any other thoughts??
Neighbour has completed restoration of a Mk2 Jag. Bodywork etc all repainted and buffed, engine rebuild with new mains and rings. It certainly looks the part ( there's also a nice set of "chrome plated" powder coated wheels to go on).
As a retired electronics engineer i've helped out with a few electrical issues and he is looking at swap to negative earth and alternator at some point but dynamo does charge ok.
Due to the current situation this year its been maybe 3-4 miles.
He noticed on recent start up that it was very "stiff" to crank and start but once its turned over it starts and will restart easier.
I popped over and checked battery with my old school drop tester and it held 9 volts or more getting the load to glow red so battery ( 12.4 volts pre-test) seems OK
Trying first start from cold the motor engaged but sat for split second before engine started to turn but then started fairly quickly.
Crank voltage from DVM was more than 9 once it turned difficult to measure of course .( my DC clamp meter is 100A max so didn't try that)
Main earth from battery to scuttle is clean, earth from other side of engine bay scuttle to engine bell housing looks clean. The drop from battery earth (+) to cam-box on cranking over after starting first time was about 0.4 volts but didn't reduce much when we used a jump lead from batt + to bell housing.
Its a newish bendix type starter and he's currently bidding on a new extra high torque one ( not cheap!). He reckons motor bell-housing faces were clean and there's the bolts too.
I'm thinking that new mains and cold 20/50 probably isn't helping and suggested a separate earth wire to starter bolts and maybe try next time cold using a jump battery too ( i'll probably repeat measurements) cant do any harm.
He was reckoning that getting the starter reconditioned he may as well fit (if he wins it) the high torque one as oil filter has to come off to remove as well.
Apologies for long post but any other thoughts??