Block Heater - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 17Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 27 (permalink) Old 01-04-2019, 09:32 AM Thread Starter
Junior Member
 
Join Date: Nov 2018
Posts: 10
My Photos: (0)
Feedback Score: 0 reviews
Block Heater

In cold weather, how long can you leave the block heater plugged in? My neighbor said I shouldn't leave it plugged in for more than 5 hours on these IDI engines. I'd like to leave it plugged in over night instead of getting up early and plugging it in at 5 or 6 am. thank you.
BGindesert is offline  
Sponsored Links
Advertisement
 
post #2 of 27 (permalink) Old 01-04-2019, 09:40 AM
Senior Member
 
Join Date: Feb 2018
Location: Middle of Montana
Posts: 155
My Photos: (0)
Feedback Score: 0 reviews
I have left mine plugger in over night before, lots of times, one truck have had for over 10 years now , with out any problems. Right or wrong don't really know.
LMJD, tbeck and oldrebuiltdodge like this.
Randy 4614 is offline  
post #3 of 27 (permalink) Old 01-04-2019, 10:01 AM
Lifetime Supporting Member
Lifetime Supporting Member
 
bugman's Avatar
 
Join Date: May 2002
Location: Gypsum, Co
Posts: 8,403
My Photos: (12)
Feedback Score: 1 reviews
You can leave it plugged in 24/7/365 and the only thing you are going to hurt is you wallet when you go to pay the electric bill.

But in the long run it doesn't do any good to leave it plugged in much longer than 3-4 hours before you need the truck. Just get a heavy duty 15-20 amp timer and set it for that long before you need your truck.

Now if you are not paying the electric bill then by all means plug it in when you get home and just leave it plugged in.
LMJD, tbeck, MrTommy and 1 others like this.

96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages, Dark Toumaline, add a leaf, Dale's TYMAR, and HX hose, downpipe, coolant filter, Luk clutch
bugman is offline  
Sponsored Links
Advertisement
 
post #4 of 27 (permalink) Old 01-04-2019, 10:25 AM
Senior Member
 
Join Date: Mar 2001
Location: Cody, Wy
Posts: 11,814
My Photos: (27)
Feedback Score: 0 reviews
When my pickup was my daily driver I had the heater on a 1500 watt timer. I found even at 10 below, 2-3 hours of heat was enough for easy quick starts. What was your neighbor's reason for no more than 5 hours? Like posted, doesn't hurt a thing.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
LMJD is offline  
post #5 of 27 (permalink) Old 01-04-2019, 10:58 AM
Senior Member
 
Steve83's Avatar
 
Join Date: Jan 2006
Location: Memphis, TN 38133, USA, Earth, Milky Way
Posts: 1,695
My Photos: (0)
Feedback Score: 0 reviews
Have you read the owner's manual &/or diesel brochure? The '92 edition says "...the heater should be plugged in at least 3 hours prior to starting. The use of the heater for longer periods of time will not cause the engine to exceed the thermostat setting." That implies that the heater has an internal t'stat which will cause it to cycle off once it reaches its design temperature. It's a 1KW heater, which means it draws 9.1 Amps @110VAC.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Steve83 is offline  
post #6 of 27 (permalink) Old 01-04-2019, 12:33 PM
Lifetime Supporting Member
Lifetime Supporting Member
 
bugman's Avatar
 
Join Date: May 2002
Location: Gypsum, Co
Posts: 8,403
My Photos: (12)
Feedback Score: 1 reviews
There is no internal thermostat on the block heaters on these trucks.

It is just a rod that is inserted into the coolant passage. It wont really get the coolant very hot just from it's design and no circulation of the coolant. That along with trying to heat up a huge block of cast iron.
LMJD and oldrebuiltdodge like this.

96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages, Dark Toumaline, add a leaf, Dale's TYMAR, and HX hose, downpipe, coolant filter, Luk clutch
bugman is offline  
post #7 of 27 (permalink) Old 01-04-2019, 01:27 PM
Senior Member
 
Join Date: Mar 2001
Location: Cody, Wy
Posts: 11,814
My Photos: (27)
Feedback Score: 0 reviews
Quote:
Originally Posted by bugman View Post
There is no internal thermostat on the block heaters on these trucks. It is just a rod that is inserted into the coolant passage. It wont really get the coolant very hot just from it's design and no circulation of the coolant. That along with trying to heat up a huge block of cast iron.
Right, and with that said, there's no way that small 900-1000 watt element is going to heat a block anywhere near engine operating temp if the outside temp is cold enough to require plugging it in.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
LMJD is offline  
post #8 of 27 (permalink) Old 01-04-2019, 05:46 PM Thread Starter
Junior Member
 
Join Date: Nov 2018
Posts: 10
My Photos: (0)
Feedback Score: 0 reviews
Thanks fellows*for all the replies, Just bought this 88 super duty, first diesel. Was told hard to start in cold weather so just cking things out. Can't remember why neighbor said not more than 5 hrs. but next time I see him I'll ask again and let you know. I also couldn't think of a reason why because of all the trucks in colder areas then where I live. It might get down into the teens but not very often. Thanks again Bill
BGindesert is offline  
post #9 of 27 (permalink) Old 01-04-2019, 06:13 PM
Lifetime Supporting Member
Lifetime Supporting Member
 
bugman's Avatar
 
Join Date: May 2002
Location: Gypsum, Co
Posts: 8,403
My Photos: (12)
Feedback Score: 1 reviews
Get the glow plug system working properly and if it just gets down into the teens you will never need to fire up the block heater.

96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages, Dark Toumaline, add a leaf, Dale's TYMAR, and HX hose, downpipe, coolant filter, Luk clutch
bugman is offline  
post #10 of 27 (permalink) Old 01-04-2019, 06:56 PM
Senior Member
 
Join Date: Nov 2008
Location: Salina, Kansas
Posts: 1,550
My Photos: (0)
Feedback Score: 0 reviews
Quote:
Originally Posted by bugman View Post
Get the glow plug system working properly and if it just gets down into the teens you will never need to fire up the block heater.
I've started in negative teens before without the block heater. When it all works right, it will start every time.

1993 F-350 crew cab non-turbo 5 speed transmission
35 years a mechanic on large stationary engines natural gas and diesel fired, and other industrial equipment.
oldrebuiltdodge is offline  
post #11 of 27 (permalink) Old 01-04-2019, 07:46 PM
Senior Member
 
79jasper's Avatar
 
Join Date: Dec 2012
Posts: 1,616
My Photos: (0)
Feedback Score: 0 reviews
Quote:
Originally Posted by LMJD View Post
Right, and with that said, there's no way that small 900-1000 watt element is going to heat a block anywhere near engine operating temp if the outside temp is cold enough to require plugging it in.
I think I recall some northerners having to plug in when they get home while the engine is still warm, to be able to have any heat in the morning.

Sent from my SM-N960U using Tapatalk

1994 F350 7.3 PSD 4X4 ZF5 DUALLY
PHP HYDRA, 6637, 3-4 DP TO STRAIGHT 4 BEHIND THE TIRE, 1.0 EXHAUST HOUSING, DIY D66 TURBO, FUGA E-FUEL, EBPV DELETE. Cooper discoverer AT/3'S.

2010 VW JETTA TDI DSG Kerma tune. Hankook ventus v2 concept 2.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
79jasper is offline  
post #12 of 27 (permalink) Old 01-04-2019, 10:38 PM
Senior Member
 
Join Date: Feb 2018
Location: Middle of Montana
Posts: 155
My Photos: (0)
Feedback Score: 0 reviews
Quote:
Originally Posted by 79jasper View Post
I think I recall some northerners having to plug in when they get home while the engine is still warm, to be able to have any heat in the morning.

Sent from my SM-N960U using Tapatalk
When it is really cold, below zero that is what I do. It helps a lot.
Randy 4614 is offline  
post #13 of 27 (permalink) Old 01-04-2019, 10:54 PM
Lifetime Supporting Member
 
ArcticDriver's Avatar
 
Join Date: Apr 2015
Location: Longmont, CO
Posts: 3,648
My Photos: (0)
Feedback Score: 0 reviews
Heck, I plug in when the temps are even +30*F when its someone elses dime and I will leave it plugged in all night...like at a hotel.

When its my own dime I plug in when its +20*F sometimes, depends on if its windy since that wind will be pulling heat away.

I have read 80% of engine wear occurs during initial cold start, that may be an exaggeration but even if its 50% then its still worth it to me to plug in a couple hours.
Randy 4614 likes this.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 CC SB 7.3 PSD w/4R100. 182,000 miles.
NOS Black CPS. ScanGauge-II, AIC, Bilstein 5100, Stancor GPR, Marinco Mod, B&W Turnover Ball, Michelin Defender LTX


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2002 F-250 4x4 SC LB 7.3 PSD w/ZF-6. 177,000 miles.
NOS Black CPS. ScanGauge-II. Bilstein 5100. Stancor GPR. Walker BTM. Noco Mod. Michelin Defender LTX 285/75/16.

SOLD:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2000 F-250 4x4 SC SB 7.3 PSD w/4R100. 164,000 miles.
NOS Black CPS. Rebuilt Fuel bowl w/gold spring, 6.0 Cooler, Walker BTM, Stancor GPR, Michelin LTX M&S2.
ArcticDriver is offline  
post #14 of 27 (permalink) Old 01-05-2019, 09:39 AM
Senior Member
 
Join Date: Mar 2001
Location: Cody, Wy
Posts: 11,814
My Photos: (27)
Feedback Score: 0 reviews
Quote:
When its my own dime I plug in when its +20*F sometimes, depends on if its windy since that wind will be pulling heat away.
Right, and quite a few "keyboard mechanics" have argued wind chill only applies to living flesh. Park your truck on a 10 day in the sun with no wind and the cab will be way warmer than the same temp on a windy day. Even with a dark color the cold wind sucks the heat right out of the sheet metal.

Heavy truck and diesel mechanic (thankfully retired after 30+ yrs)
'91 F-250 SC 4X4, 5spd. ATS Turbo, 3:55 diff.
LMJD is offline  
post #15 of 27 (permalink) Old 01-05-2019, 11:10 AM
Lifetime Supporting Member
Lifetime Supporting Member
 
bugman's Avatar
 
Join Date: May 2002
Location: Gypsum, Co
Posts: 8,403
My Photos: (12)
Feedback Score: 1 reviews
The wind does cool things off a lot faster but metal can not be cooled any lower than the ambient temperature that surrounds it.

The effect of wind chill is to increase the rate of heat loss and reduce any warmer objects to the ambient temperature more quickly. It cannot, however, reduce the temperature of these objects below the ambient temperature, no matter how great the wind velocity.

I do agree that a vehicle parked in the sun on a 10 degree day will feel warmer than the outside temperature and if a wind kicks up it is going to cool off but it will go no lower than what the temperature is outside of the vehicle. So it goes from lets say 50 degrees inside temperature down to 10 degrees as the wind blows across the metal of the vehicle. But the inside temperature will get no lower than 10 degrees.

96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages, Dark Toumaline, add a leaf, Dale's TYMAR, and HX hose, downpipe, coolant filter, Luk clutch
bugman is offline  
Sponsored Links
Advertisement
 
Reply

  Diesel Forum - TheDieselStop.com > Ford Diesels > 7.3L IDI Diesels (Not Power Strokes)

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Forum - TheDieselStop.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome