2 replies to this topic

[Kernreuben]

Hi guys,

I've just rebuilt my 1275 A+ to 020 oversize and wanted to do a bench test before I put it back in the car but have not been able to get it to crank properly (without fuel or ignition) using jump leads from the battery straight to the starter. When I connect it, the starter goes until it gets to the compression stroke of a cylinder then almost stops as it pushes past and then continues to the next cylinder compression. It cranks perfectly if I take the plugs out, just struggles under compression.

I've checked (and double checked) cam timing is good

Battery is fully charged and I have tried multiple

Have tried 2 different starters

 

Any advice is much appreciated. I'm stuck.

 

https://www.youtube....rts/WVKM2E5W-k0

 

 

[Spider]

Hi and welcome to the forum.

 

I'd suggest this could well be your jumper leads or battery. The jumper leads are quite often made cheap, with the copper of the cables sorta barely crimped.

 

Connect your Multimeter directly to the engine frame and the starter terminal, select volts, and try that again, I'd say you are probably seeing around 7 volts there when it hits compression. Do the same test again, but connect your meter directly to the battery the 2nd time around, that'll show if the battery has the life it needs

[Kernreuben]

Thanks spider, you’re right with the voltage to the starter at around 7 so I think it’s a combination of the starter and leads. I’ve cleaned the brushes in the starter and will put the engine back in the car tomorrow so I can wire everything up properly and go from there.