Westerbeke generator
- Thread starter Dkk3000
- Start date
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If you have answers, please help by responding to the unanswered posts.
If you have answers, please help by responding to the unanswered posts.
Crusty Chief
Guru
I concur, but you pretty much have to hit that preheat switch to start the darn thing.
Hope we helped in some small way, if not, maybe time to concede and bring in the experts, such as they are, LOL!
Barking Sands
Guru
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Dkk3000..if you are still stumped with this after Christmas I would be glad to come out and help. My boat is in Tarpon Springs.
mike66
Guru
My mistake on the layout of your generator. Evidently your fuel run solenoid is threaded into the back of the fuel injection pump. Principle is the same though. It needs to be energized when the preheat switch is on in order for fuel to be delivered to the injectors. My 8.0 has an external lever that the solenoid pulls open.
Dkk3000
Veteran Member
No I jumped the switch with 12 V and it work, nothing will work with the pre-heat switch. That’s why I’m wondering if it’s not the relay inside the electrical box. I’m going to check the switches this morning. I believe the water temperature Swiches should be open and the pressure switch should be closed. I think
mike66
Guru
Got it. Did you try jumping the preheat toggle switch to see if that's not defective? Also the stop switch is normally closed so you can jump that as well to make sure that it hasn't gone bad and is staying open.
Be careful about cranking too much if you're in the water with the seacock open.
Be careful about cranking too much if you're in the water with the seacock open.
twistedtree
Guru
I think you are close with the relay. Check to see if the control signal is activating as it should. That's the other thing that could be preventing the relay from doing it's thing.
Also, you could try pulling out the other relays and trying that to see if it correctly works. That would tell you if it's a bad relay, or something else. Or just get a new relay and try it. No harm in having a spare on hand.
twistedtree
Guru
I think you have a bad relay. The preheat switch bypasses the various safety switches, so they are not at play until you release the preheat switch. You could swap in the other relay to confirm, assuming they are the same.
BTW, it would appear that the schematics posted earlier are for a different model or generation of generator. You have two relays shown in the picture, but there is only one in the schematic. So take that schematic with a grain of salt.
twistedtree
Guru
There are probably lots of sources. Any manufacturer name or part number visible on it? I assume it’s a 12v genset, and not 24v?
I’ll beat most any automotive generic “cube” relay would work. Just look for similar sized thermals. They look like spade terminals with slip on connectors on the wires? Should be pretty easy to find an equivalent part.
Dkk3000
Veteran Member
I’ve got to relays. I’m not sure what the other one does. I was thinking about swapping them out and see if the pre-heat switch will work. Is the other one for the starter? The way it is now, with the pre-heat switched down the engine will turn over
Crusty Chief
Guru
NomadBill
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Hi DKK, Our Westy BTD 8kw had this same issue...ran fine then one day NO clunk when preheating. For us it was the "Fuel shut off Solenoid" and we confirmed that by sending me down to manually push the solenoid open. While the missus started it normally with 15sec for glow plugs to glow. Try that before you chase other things, it's easy and confirms the issue. Our generator once it fired would run normally....then i let go of the solenoid and it's running. Until next time you need to use it.
Our fix was fit a new one purchased online for $170, fix took less than 30 min.
Good luck
Our fix was fit a new one purchased online for $170, fix took less than 30 min.
Good luck
mike66
Guru
Nomad, same here with my 8.0. Evidently the solenoid continues to work to hold the lever in the on position, just doesn't work to pull the lever open. His solenoid setup is different, it works directly on the fuel injection body without the lever.
porman
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I don't know if this has been mentioned before. On most relays the activation circuit are numbers 85 and 86. One of those should ground. The hot source is number 30. The load is number 87.
twistedtree
Guru
Any of these should get it running
https://www.oreillyauto.com/search?q=relay
Also google Bosch cube relay. You can get a 10-pach of "Bosch style" relays for $10.
https://www.oreillyauto.com/search?q=relay
Also google Bosch cube relay. You can get a 10-pach of "Bosch style" relays for $10.
BruceK
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Exactly what I did with an Onan MDKD 6.5. A new $400 solenoid from Onan/Cummins fixed the problem,got a back up one via Ebay for $65. Both made in China,probably in the same factory.It`s usually the fuel solenoid.
Note it has 1) a pull in function and 2) a hold function. You can get it running manually if 2 still works by doing 1 manually, but you`d soon tire of manually replacing 2.
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mike66
Guru
DKK, the relay is just a switch that connects the circuit for the preheat and fuel solenoid to power. It seems to me that connecting the hot leads on the load side to each other should operate the solenoid and glow plugs so that you can fire up the engine with the starter switch.
