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Old 03-06-2020, 04:01   #1
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Perkins 4.107

Hi all,


I have taken a photo of the part of the engine, that I do not know anything about. I am hoping that with your guidance, it may lead me to making an informed decision on the repair or replacement.

The +ve Cable from the 12v Battery connects directly to it.

The reason for highlighting this, is that when the motor starts within 2-3 secs, everything seems fine. However, beyond the 3 secs of cranking the engine, I see smoke rising from it.

I can't quite make out precisely where the smoke is coming from because the ignition key is about 4.0' away. It has happened less than 6 times already and it hasn't affected anything else on the operation of the engine (so far).

Any words of wisdom highly appreciated.
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Old 03-06-2020, 04:18   #2
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Re: Perkins 4.107

It looks like the starter motor solenoid. It switches the battery power to the starter motor when you hit the key start. The terminals and the contacts inside carry the full starter motor current.

There is a lot of corrosion on these terminals and they really need to be cleaned up. The smoke might be coming from the terminals.

The contacts inside might also be burnt / corroded and the smoke could be doing from them.

The corrosion causes an increased resistance which in turn creates heat when a large current is passed though the terminals and internal contacts.

A new one might in order .
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Old 03-06-2020, 04:45   #3
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Re: Perkins 4.107

Pickup a Cole Hersee starter solenoid (Intermittent duty is fine). Simple DIY replacement. Just make sure to disconnect negative battery cable as Step 1. Here's one from Amazon for about $21. Any decent chandlery will have it too for about the same, maybe less. Or any auto parts store will have one, though they will annoy you with questions about year/model/make of your car.

https://www.amazon.com/Cole-Hersee-2...1184419&sr=8-9
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Old 03-06-2020, 05:11   #4
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Re: Perkins 4.107

Or for the Aussie based OP

https://www.ebay.com.au/itm/CONTINUO...4383.l4275.c10

This would be a good time to check the quality and size of the existing battery cables / terminals as well!
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Old 03-06-2020, 15:44   #5
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Re: Perkins 4.107

Thank you EVERYONE, it is so refreshing to find helpful guru's out there prepared to impart their knowledge.

So the action plan is to 1) replace the Starter Motor Solenoid and 2) check the wires leading to the Solenoid leading from the battery.

I'm assuming that checking the wires involves making sure the wires are not frayed, and the correct size?

And checking for the quality of the wire would be best achieved with a multimeter checking for resistance?

As for the size, I guess delving into google and/or the solenoid manual if the right wire size is mentioned for the desired amps. The batteries and engine are only about 2' apart.
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Old 03-06-2020, 16:26   #6
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Re: Perkins 4.107

I would just plan on replacing that cable. Open ended terminals, chances are that corrosion goes 6Ē plus down inside the cable sheath. Get some quality marine cable, closed terminals and waterproof shrink tube, itíll last forever.
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Old 03-06-2020, 16:47   #7
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Re: Perkins 4.107

When you buy your solenoid, there's a similar model the has a button where the bump is in the middle of the top. It allows you the option of starting or jogging the engine from the engineroom. Nice for adjusting the valves.
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Old 03-06-2020, 17:22   #8
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Re: Perkins 4.107

Quote:
Originally Posted by Lepke View Post
When you buy your solenoid, there's a similar model the has a button where the bump is in the middle of the top. It allows you the option of starting or jogging the engine from the engineroom. Nice for adjusting the valves.
I did not know this! Thanks Lepke -

Peter
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Old 04-06-2020, 02:29   #9
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Re: Perkins 4.107

Quote:
Originally Posted by Kokonut View Post
..............
And checking for the quality of the wire would be best achieved with a multimeter checking for resistance?

As for the size, I guess delving into google and/or the solenoid manual if the right wire size is mentioned for the desired amps. The batteries and engine are only about 2' apart.
No, you can't use multimeter to measure the resistance of these heavy cables; the meter is simply not accurate enough to measure battery cables where the resistance will be in the order of milliohms. Your multimeter will only be accurate to a few ohms (on a good day). You can use a special low ohm (conductance) meter but I sure you don't have access to one of these.

Given the age of the old cables and going by the picture you posted, I agree with rbk, get new ones. As you probably don't have the tooling to make them, simply buy pre-made ones from your local chandlery. I suggest a wire size 50mm2 but if this is unavailable locally, try for 70mm2 which will be overkill but bigger is better
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Old 04-06-2020, 04:20   #10
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Re: Perkins 4.107

Anyone know a source/part number for the solenoid with the button??


Thanks
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