Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Intermittent starter motor problem - help please!
adrianreeve

posted on 27/4/12 at 03:12 PM Reply With Quote
Intermittent starter motor problem - help please!

Hi guys, car is now finished at Atspeed, all good, very happy. One small issue that came up was a duff starter motor. Atspeed replaced it with a recon one, but have said that sometimes the starter is still a little reluctant to turn over. They and I both suspect an earthing issue, but there is a brand new earth strap going directly from the starter to the chassis, so don't know what else to do really!

Answers on a postcard please...!!!!

Cheers

Adrian

View User's Profile View All Posts By User U2U Member
big-vee-twin

posted on 27/4/12 at 03:19 PM Reply With Quote
Main Earth straight from the battery -ve to the engine block, with a smaller earth from engine to chassis to serve the electics.





Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016

http://www.triangleltd.com

View User's Profile View All Posts By User U2U Member
daviep

posted on 27/4/12 at 03:20 PM Reply With Quote
Is there also a good strap from the battery -VE to the chassis and are all the connections nice and clean and tight and not on top of paint or rust?

If they are then it's not an earth fault.

Cheers
Davie

[Edited on 27/4/12 by daviep]





A truly great library contains something in it to offend everyone.

View User's Profile E-Mail User View All Posts By User U2U Member
adrianreeve

posted on 27/4/12 at 03:43 PM Reply With Quote
I have an earth from the battery to the chassis, and one from the chassis to the engine block. Would it make much difference then having the earth to the engine block direct from the battery? I assumed the chassis would be a good enough conductor. Easy to check with another longer earth lead i guess!

Cheers

Adrian

View User's Profile View All Posts By User U2U Member
Agriv8

posted on 27/4/12 at 03:51 PM Reply With Quote
quote:
Originally posted by adrianreeve
I have an earth from the battery to the chassis, and one from the chassis to the engine block. Would it make much difference then having the earth to the engine block direct from the battery? I assumed the chassis would be a good enough conductor. Easy to check with another longer earth lead i guess!

Cheers

Adrian


a jump lead could be your freind here to assis fault finding

regtds agriv8





Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a tree full of a*seholes .............


View User's Profile View All Posts By User U2U Member
daviep

posted on 27/4/12 at 04:04 PM Reply With Quote
Quick and dirty method if you think you have a bad connection, pull the ignition wire off the coil to stop the engine starting and then turn the engine over on the the starter for a few seconds, have a feel at all the cables and connections +ve and earth, if you have a bad connection it will be nice and warm.

A more scientific method would be to do a voltage drop check. Set your meter to volts, put one probe on the +ve battery terminal and the other on the terminal on the starter solenoid which has the very short cable to the starter motor. Crank the engine (still with coil disonnected) and watch the volt meter, you shoudn't read more than about 0.5v, that's the amount of voltage being lost in the cables and connections.

Do the same with the earth side, one probe on battery -ve nd the other on the starter motor casing.

If you get any high readings indicating a lot of voltage is being dropped somewhere just start moving the probe back towards the battery one connection at a time until the drop disappears.

Cheers
Davie





A truly great library contains something in it to offend everyone.

View User's Profile E-Mail User View All Posts By User U2U Member
big-vee-twin

posted on 27/4/12 at 04:07 PM Reply With Quote
Leads to the starter in theory should be as short as possible with minimum joints.

On a 12v system, small amounts of resistance can make a difference especially at heavy currents.





Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016

http://www.triangleltd.com

View User's Profile View All Posts By User U2U Member
ashg

posted on 27/4/12 at 09:39 PM Reply With Quote
are you sure its not binding? a couple of the skcc lot had similar troubles and after fitting a different model starter it was worted. think it may have been a burton high torque one but am only 60% sure on that.





Anything With Tits or Wheels Will cost you MONEY!!

Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)

View User's Profile View All Posts By User U2U Member
adrianreeve

posted on 27/4/12 at 09:55 PM Reply With Quote
Did have similar concerns Ash. Any idea what model they replaced it with?

Cheers

Adrian

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [ 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.