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Old 06-21-2023, 01:47 AM   #1
Mini-Skoolie
 
Join Date: Jul 2010
Location: The Evergreen State
Posts: 12
3126b head interchange

I know nothing about these, so if this is a dumb question, don't beat me up too bad. I'm looking at a 2000 3126B that dropped a valve. The hp rating is 330 as I recall, and it's my understanding that the higher hp motors have different internals then the lower hp motors. What I don't know anything about is the head.
I'm fairly certain I can get somebody to bore and sleeve the cylinder, but I'm wondering if the head is different between the high and low hp motors. I've read that there's different injectors in the 175-190 hp motors, but are the head castings the same? Can I use whatever I can get, presuming it's within a proper year range, or do I need a head specifically for a 330hp motor?

Any input appreciated.

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Old 06-21-2023, 12:30 PM   #2
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 19,822
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
Quote:
Originally Posted by mudpie View Post
I know nothing about these, so if this is a dumb question, don't beat me up too bad. I'm looking at a 2000 3126B that dropped a valve. The hp rating is 330 as I recall, and it's my understanding that the higher hp motors have different internals then the lower hp motors. What I don't know anything about is the head.
I'm fairly certain I can get somebody to bore and sleeve the cylinder, but I'm wondering if the head is different between the high and low hp motors. I've read that there's different injectors in the 175-190 hp motors, but are the head castings the same? Can I use whatever I can get, presuming it's within a proper year range, or do I need a head specifically for a 330hp motor?

Any input appreciated.

one way to find out would be to get the VIN of your prospective bus and the engine serial if you can.. and then have someone with same year lower rated 3126 of the same year get their VIN and lcall a cat dealer to ask about replacing the head casting alone.. it may not be sold that way so its a crap shoot as the dealer may only sell a head populated with valves and such.. its likely if the RPM range of a higher HP unit is any different that the valve springs may be different.. but its worth a shot
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Old 06-30-2023, 07:03 AM   #3
Skoolie
 
Join Date: Jul 2015
Location: New Hampshire
Posts: 228
Year: 2001
Coachwork: Thomas
Chassis: MVP ER
Engine: Cat 3126b 210 HP 605 ftlbs
the head should be fine, you can call cat. I have attached a rerate sheet to cross reference turbo, injectors, pistons, ect.
Attached Files
File Type: pdf CAT 3126 rerate.pdf (46.5 KB, 5 views)
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