If I leave my 751 in the garage with heat it starts first try every time but if I were to leave it outside overnight in the cold forget it starting. I checked the glow plug rail and i am getting 9v and I am thinking it should be 12v. I was wondering if I need to replace the glow plugs or is it something else. Thanks,DMK
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OldMachinist
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It should be 12v. Check the connector to the glow plug control box for corrosion. It's next to the other relays.
I located the relays. There is not corrosion. How do I test the relay with a meter? DMK
OldMachinist
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The Pug engines are a bit tough to start in the cold. Even in Brisbane winters it can be a bit hard, thats never below freezing.
The box OM is talking about is the glow timer. It just does a fixed length glow and assumes its enough. I have gone to start the machine and let it glow, the light goes out, turn it off and on again to restart the glow cycle. This should get it a bit hotter.
The starters i believe are a bit under powered too, it doesn't seem to spin the engine over as fast as i would like to get the heat during compression to get it to fire.
Give it a glow and see if the connections at the glow timer are getting hot, if so, clean them as you are loosing power at any spots that generate heat.
The box OM is talking about is the glow timer. It just does a fixed length glow and assumes its enough. I have gone to start the machine and let it glow, the light goes out, turn it off and on again to restart the glow cycle. This should get it a bit hotter.
The starters i believe are a bit under powered too, it doesn't seem to spin the engine over as fast as i would like to get the heat during compression to get it to fire.
Give it a glow and see if the connections at the glow timer are getting hot, if so, clean them as you are loosing power at any spots that generate heat.
The Glow plug timer relay on the power side is 12V but the wire to the Glow plugs is 9V. When I turn the key on, the wire for the glow plugs gets extremely hot. The relay will click so I assume the relay is good. Does this mean there is resistance coming from the glow plugs and that I should replace the glow plugs or the Glow plug timer relay? I really appreciate your help. DMK
OldMachinist
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It should not get really hot, more heat = more power loss.
How hard is it to access the plugs, if you can remove them and hook them up to a battery to confirm they glow right to the tip.
Another way i have done it in the past is to hook up a jumper cable to the +ve terminal and the other to a screw driver. I then pushed the screwdriver on to the glow plug rail for 20 seconds. Get someone to crank the engine while the plugs are heating and it should start right up. Don't leave them hooked up for long after the engine starts or you risk burning them up.
I had a similiar problem with mine. It was re-wired at some point and they had a 18 gauge wire connecting them to the relay. Replaced with a #6 wire and that helped a lot....ended up with about 11.8 volts to plugs with a full 12V battery. You might try and use a jumper cable and go straight from the + side of battery to glo plug buss bar. Do that for about 15 seconds or so and see if that helps. That should tell you if it's the plugs or not. If that doesn't help, it's in the wiring to the buss. Did you check your battery voltage when the glow plugs are on? If it's starting out less than 12V, that won't help....pulling 40-60 amps is bound to have some voltage drop. Mike
