BLOCK HEATERS

They can be piped into your oil cooler fittings. I have Kim Hotstart heaters they work great

I think, immersion heaters work best.
I have immersion heaters that are inserted in a freeze out plug near the starters.
My block heaters are plugged into a Tstat and keep the engines and engine room warm and dry year round.
I only shut them off when the outside temp stays above 70

The mains crank right over in below zero weather and sound like butter.

The wolverine heaters are a close second.
(I also have them)
The wolverine heaters actually gets glued onto the bottom of the oil pan with a special adhesive.
Wolverine has a website and is a US owned company.
The owner actually answers the phone and is quite helpful.
I have the 500 w ones on my boat. but I would recommend 2 500w on each engine.

Contact your Detroit Diesel ( Johnson & Towers in your area) they can give you the info you need. I prefer the in block fresh water heaters 1500W or 750watt on a regular timer switch. You may need to use 8 or 10 gauge wire and a 30 amp breaker in your panel depending on the length of the run. The first ones I put in (prior engines) were 750 w and worked fine but I'm in florida so not much cold weather. The Florida Detroit Diesel dealer in Panama City could only get the 1500w units (rebuilt engines) they heat a lot quicker and you don't have to run the timer as much. Don't know about the 92'S but the 6-71 have a plate just above the starter where they install easily.

1500 watt heaters with t-stats makes a great combo. My t-stats were on (approx) at 50 off at 80 degrees.
Heaters were in the side of the block and the t-stats were on upper most water pipe.

Call Hotstart ask for Ted Smet, great guy to work with!
509-536-8661

This is a 250 watt in block heater combo with t-stat. Part numbers below.

DD-751-WOC
TC031310-866

250 or 750 ?

That thermostat is 100-120. Personally I think that is a bit high.

When you goog-a-late the DD-751-WOC it comes up as a 750 watt unit at 120 volts which draws about 6.25 amps.

Yes, it's 750 watts- my error. My original quest was to find the low amperage
Draw, so my search to find a 250 unit that wasn't a stick on adhesive pad type. The people at Hotstart helped me with this combo- my apologies for any inconvenience.

The pre-heater story.

I think I've told it on YF a few years ago, but anyway.

I had MTU V8s, the old buggers, that had no pre-heat. When I ran them up, I had to tell the other 10 boats down wind that I had gas, 'cos the exhuast fumes were heading their direction.

BOOM! Ooh, they smoked a bit, but heck, the bloody noise on open pipes was jolly impressive.

The girlfriend has now booked a table in the hills overlooking the marina. Nice.

The deckhand then runs-up the engines. Not only do we hear the twin V8s from up on the mountainside, but the cloud of fumes, heck, you could of seen from space.

Heaters? Hell yes!

I had Phillips Temro Zero Starts 1000w on my 8v92's and loved them. The thermostat controled the coolant temp at around 100 degrees, IIRC. Kept the engine rooms and lower deck of my Hatt 56MY dry and toasty (I left the ER doors open and the vents closed when docked). Got great service from the company too. https://phillipsandtemro.com/solutions/engine-heating-solutions/electric-immersion-heaters/

They have a fitment guide for each engine type and were very helpful over the phone too.