Slow Start of a Cold Engine

[KenKrawford]

I've noticed that the last couple of times I've started my engine, it was slow to start.
Here's my situation:
4 brand new Trojan T-105 batteries wired in series (to give 12 volts) and then in parallel to give one 420 amp hour bank.
Batteries are fully charged.
All lugs on the cables connecting the batteries were cleaned after new batteries were installed.
The volt meter on the pedestal show 13 volts when pre-glowing.
I pre-glow my engine for about 10 seconds, release the key from the pre-glow position and then press START.
In the past the engine would start immediately. Now it cranks for about 5 seconds before starting. After starting, it runs perfectly and will start immediately when hot.
My initial suspicion is that I have a bad glow plug(s). If so, I've never dealt with glow plugs before. Are they just like spark plugs in a gas engine?
Any thoughts or suggestions are welcome.

[wolfe10]

Yup, either glow plug(s) or glow plug relay. Either one could cause your symptoms and both are potential failure points.

Voltmeter will tell you if 12 VDC positive is going from relay to glow plugs when someone turns the key to the pre-heat position.

If relay is good, disconnect the lead to each glow plug and checking between it and the head/block for Ohms/resistance. I don't have the resistance figures in front of me, but a bad one, will be different than the others.

[KenKrawford]

Thanks Brett. I forgot about the relay. On my C34 with a Universal M25XP engine there was no starting relay so I added one. When it would burn out, the engine wouldn't start at all.

[KenKrawford]

Turns out the relay (solenoid) was the problem. A surprise source for the part turned out to be Home Depot! The only difference I can see is the Westerbeke silver paint.

[wolfe10]

Ken,

Glad you found it and it was a relatively inexpensive and easy fix.

[TBOT422]

Ken,

I have had repeated failures of the pre-heat solenoid. I found the pre-heat solenoid to be a Ford Starter solenoid. I have used the black one like you show. It failed and I replaced it with a red 'Heavy Duty' one and it failed. Most recently I replaced it with a blue one that is supposed to be 'marine' grade. I haven't tested it lately to see if it has failed yet. I bought all of them on e-bay for around $8. Search for "Ford Starter Car Truck & Marine Solenoid Relay 12V HeavyDuty SW3 - Blue". They seem to have little function in the warm climate of central Florida.

[wolfe10]

No first hand information, as ours has not failed, but I would sure consider a CONSTANT DUTY solenoid vs the start solenoid. And, upping the amp rating another good idea. Unlike a fuse, using a higher rated solenoid has no negative/dangerous effects, but more surface area in the contacts.

The glow plugs and therefore the glow plug relay stay on much longer than a starter motor. Could cause the points in the solenoid to arc and materially shorten the solenoid life.

[KenKrawford]

Gary, when I do an Ebay search using your parameters, the first solenoid shown sells for $999 ! Price mistake?
Brett, you raise a very important issue of constant duty vs starting with the former being a much beefier item. If/when the one I just installed dies I think I'll give this one a try - https://www.amazon.com/dp/B0064MX7US/?c ... _lig_dp_it It is rated at 65 amps continuous duty.

[TBOT422]

Ken,
I agree with you. A lot of links to that solenoid show not available. I did find one still available at http://www.necessityonline.com/index.ph ... s_id=70335, but I also agree with you and Brett. I think the continuous duty solenoid may be a better solution.

[wolfe10]

Here is a 200 amp continuous duty Cole Hersee solenoid for under $60:

https://www.amazon.com/HERSEE-TERMINAL- ... B00FGJIJR6

[jrohrbaugh]

What solenoid is the best option.
Parts list shows 24 volts?
I have never had starting issues but now it takes a while to start. Even in Florida I usually use the glow plug.
Thanks for any ideas.
Love this forum
So helpful

[wolfe10]

Have you verified that the glow plug solenoid is good/bad? That is the first step.

If the solenoid tests good, and slow start even with engine turning over at normal speed, next step is to individually check the glow plugs.

[jrohrbaugh]

I put in a Westerbeke solenoid yesterday. P/N 024639. Cost $39 from my local boat yard.
Fixed the problem!
Thanks for all the info

[c350ia]

The volt meter on the pedestal show 13 volts when pre-glowing.
I pre-glow my engine for about 10 seconds, release the key from the pre-glow position and then press START.

I only recently got my 350 "Trevi" hull 460. I have been starting the engine by turning key to on and then immediately hitting the start button. Sometimes takes a few turns to start. Obviously I am not activating the glow plugs first. How does one activate the glow plugs? What is the "pre-glow" position?
Thanks
Trevor Rabie

[KenKrawford]

Trevor with they key in the "ON" position the low oil pressure/ high temperature alarm should be sounding. Continue to turn the key clockwise until it won't turn any further. This engages the glow plugs. On a cold engine I usually hold in that position for a "10 count" and then release the key back to the on position. Then press the "start" button and the engine should start. On a warm engine pre-glowing isn't necessary and the engine should start immediately.

[c350ia]

Ken,
Thanks much for the info. I think you meant counter clockwise but I get it!
Interesting but I could find no reference to the glow plug position in the Catalina manual for my 350.
Best
Trevor

[wolfe10]

Yes, glow plugs are important in starting, particularly if in cold conditions (engine not warmed up).

The system consists of the key/ignition switch, a glow plug relay and the glow plugs themselves.

[c350ia]

Thanks for info. Ken was correct, turn key clockwise, hold for 10 secs bingo easy start. Wish they would have had that info in the manual!