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Old 08-12-2021, 03:32   #1
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Cold start Aid.

Hi. Can someone please tell me, how to connect preheated on my Perkins 1.408.
Very difficult to start in cold weather. See foto.
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Old 08-12-2021, 03:38   #2
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Preheated 4.108

Can someone please help, how do I connect Cold Start Aid, on my Perkins 4.108
Very difficult to start in cold weather. See foto
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Old 08-12-2021, 05:26   #3
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Re: Preheated 4.108

Welcome to the forum, Rene. Hey, you've posted the same question twice. Could you delete one copy?
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Old 08-12-2021, 06:43   #4
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Re: Preheated 4.108

Quote:
Originally Posted by Rene Houmoller View Post
Can someone please help, how do I connect Cold Start Aid, on my Perkins 4.108

Very difficult to start in cold weather. See foto
Connect a fused supply, rated for 15 amps, through a push button starter type switch to the male spade connector that you circled in your picture. When you go to start the engine, push the preheat button, count to ten, then the engine starter button.
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Old 08-12-2021, 07:11   #5
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Re: Preheated 4.108

I would consider replacing the old thermostart with a new one and then wire as needed.


Some of the Perkins ignition switches had a turn and hold to activate the preheat. on some, the key would turn opposite of the start direction, and hold to activate,, then turn on others it was turn towards start about half way hold and then it would activate, and continue turning key to activate the starter.


absent that wire as fourlyons indicated


if the thermostart was installed, then in all likelihood, the wire is there somewhere. if you look on the exposed spade in your pic, you can see where something had scratched the paint from being slid on and off.
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Old 08-12-2021, 10:26   #6
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Re: Cold start Aid.

If the engine is not worn out, reluctant cold starts may be a defect in the glow plug system, or low compression caused by stuck piston rings. Diesels that are not maintained with either frequent oil changes or good bypass filtration are prone to stuck rings, especially if not run hard regularly.

Diesels that are idled for long periods or not run under significant load can also develop glazing on the cylinder bores which may also contribute to low compression. As compression is what causes the engine to fire, low compression means hard starting.

If addressing those potential problems does not resolve the issue your engine is probably in need of a rebore and new rings and pistons.

Your first step, after a careful look-over and a compression test, should be to change the oil and then warm the engine up and take your boat out for a near-full throttle run of several hours at least, keeping a close eye on engine temperature while you do so. If your rings are moderately "sticky" and the bores moderately glazed, that may be enough to restore better compression. A solvent such as "Sea Foam" may help speed that process.

Of course if maintenance and use fits the previous description, then the "engine workout" process has to be repeated regularly.

If those steps don't work, pull the injectors and have them tested, and check the timing of the injection pump.

Maybe start with a compression test first of all.
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Old 08-12-2021, 10:38   #7
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Re: Cold start Aid.

Quote:
Originally Posted by Rene Houmoller View Post
Hi. Can someone please tell me, how to connect preheated on my Perkins 1.408.
Very difficult to start in cold weather. See foto.
Well.... jumping to an engine rebuild is a bit of a leap!
I can't tell you how to connect, I never used the preheat on my 4-108 here in the Pac NW. But we dont get that cold. 15 degrees on a severe year once or twice. But usually not under 28 degrees or so over night.
One way to make it easier to start is to put a 100 watt bulb in the engine room near the engine. But now incandescent bulbs are hard to find. Any form of heat helps a lot. Those Davis Air Dryer things that draw about like a 100 watt bulb keep and engine compartment warm.
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Old 08-12-2021, 11:24   #8
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Re: Cold start Aid.

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Originally Posted by Cheechako View Post
Well.... jumping to an engine rebuild is a bit of a leap!
I can't tell you how to connect, I never used the preheat on my 4-108 here in the Pac NW. But we dont get that cold. 15 degrees on a severe year once or twice. But usually not under 28 degrees or so over night.
One way to make it easier to start is to put a 100 watt bulb in the engine room near the engine. But now incandescent bulbs are hard to find. Any form of heat helps a lot. Those Davis Air Dryer things that draw about like a 100 watt bulb keep and engine compartment warm.
Thanks. Her I Denmark 🇩🇰, we now have below 0 degrees. I have got a answer, how to connect, I think it will make a difference.
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Old 08-12-2021, 14:28   #9
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Re: Preheated 4.108

Or install a block or oil pan heater.
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Old 08-12-2021, 18:32   #10
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Re: Cold start Aid.

Quote:
Originally Posted by Rene Houmoller View Post
Thanks. Her I Denmark , we now have below 0 degrees. I have got a answer, how to connect, I think it will make a difference.
Yes, it makes a huge difference. I did this on my daughter's 4108.
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