Oil cooler bypass?
- Kapman
- Club Member
- Posts: 44
- Joined: Wed Jul 03, 2013 3:22 pm
- Location: Maple Ridge, BC
Oil cooler bypass?
I just blew my oil cooler (rust). Anybody know if it would be safe to bypass it for a little while, I'm thinking a week or so until I get a new cooler. No towing or long distance driving, 20 km max. My truck has been running at 220 F lately so that's why I ask. And yes this is the perfect opportunity to clean my rad stack.
- whitehumh2
- CHC Trail SuperGuide
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- Location: Lachine, Quebec
Re: Oil cooler bypass?
Just make sure your bypass has no kinks and you should be fine!
<p class="bbc_center">1 - There is a time for everything,
and a season for every activity under the heavens:
3b - a time to tear down and a time to build,
5 - a time to scatter stones and a time to gather them,
Ecclesiastes 3:1,3b&5a
and a season for every activity under the heavens:
3b - a time to tear down and a time to build,
5 - a time to scatter stones and a time to gather them,
Ecclesiastes 3:1,3b&5a
- Kapman
- Club Member
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- Joined: Wed Jul 03, 2013 3:22 pm
- Location: Maple Ridge, BC
Re: Oil cooler bypass?
I was just going to connect the two hoses together that normally go to the cooler. I think I can find the fittings I need easy enough.
- Monk
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Re: Oil cooler bypass?
I cleaned my stack last year, defiantly needed it,
Last edited by Monk on Thu Apr 02, 2015 10:49 pm, edited 1 time in total.
96 HMC4
Optimizer N/A
Super Swamper IROKS 39.5x13.5x 16.5
Optimizer N/A
Super Swamper IROKS 39.5x13.5x 16.5
- Roy
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- Location: Stratford,Ontario
Re: Oil cooler bypass?
Get 2- 90 deg fittings with a connector, or a short lenght of hose with ends on it
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5.9 Cummins 12 valve mech. Stocking most parts to fix your H1

41.5-13.5 R16.5 Pitbull Rockers,
Auburn lockers front and rear
Full custom underbody protection
3" body lift
4" side rock tubes
12100 rear cv shafts
519-272-1761 
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- Kapman
- Club Member
- Posts: 44
- Joined: Wed Jul 03, 2013 3:22 pm
- Location: Maple Ridge, BC
Re: Oil cooler bypass?
Off hand do you know the fitting size and type? They look like -8 jic.
- Kapman
- Club Member
- Posts: 44
- Joined: Wed Jul 03, 2013 3:22 pm
- Location: Maple Ridge, BC
Re: Oil cooler bypass?
Off hand do you know the fitting size and type? They look like -8 jic.
- GreenMeanie
- CHC Pilot
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Re: Oil cooler bypass?
I think bypassing the oil cooler will be fine for a short time. I am actually going to install a bypass valve into my truck to remove the oil cooler from the loop at startup until the oil in the engine heats up and pressures stabilize.. I do a lot of highway driving and the oil takes way too long to get hot.enough for highway operation at 70-85mph. I find it takes a good 1/2 hour driving at 55mph to get the oil warmed up enough to be comfortable putting your foot down.
Heath had this issue with the Land Speed Racer and found that the oil wasn't coming up to temp until near the end of his runs at which time a performance increase was noted.. Once the oil heats up the engine will actually run very well at 3krpm and higher. Also nice hot oil helps strip the crap deposits out of the engine so it doesn't sludge up. IMO the 6.5 sludges up due to the low rpm averages folks run the their engines. If your one of those guys who keeps at 55mph its probably good to run in third gear from time to time to turn the oil and water pumps a bit to gets things moving around inside the engine.
Heath had this issue with the Land Speed Racer and found that the oil wasn't coming up to temp until near the end of his runs at which time a performance increase was noted.. Once the oil heats up the engine will actually run very well at 3krpm and higher. Also nice hot oil helps strip the crap deposits out of the engine so it doesn't sludge up. IMO the 6.5 sludges up due to the low rpm averages folks run the their engines. If your one of those guys who keeps at 55mph its probably good to run in third gear from time to time to turn the oil and water pumps a bit to gets things moving around inside the engine.
Early 1997 HMC4, 1 of 35, Original Block H296, 110,000 miles and no cracks yet, G10 green
Custom made Brush Gaurd, Roof Rack, Overhead Console and Sound System.
Custom made Brush Gaurd, Roof Rack, Overhead Console and Sound System.