More engine power in dukw

Amphibious Wheeled Military Vehicles, Wanted, For Sale (NO AUCTION or EBAY) and Knowledge Base
Dodgeguy1942
G-Sergeant First Class
G-Sergeant First Class
Posts: 80
Joined: Mon Dec 30, 2013 12:58 am
Location:

More engine power in dukw

Post by Dodgeguy1942 » Fri Feb 09, 2018 4:04 pm

I would like to get a more powerful engine into my Dukw. Which 302 gmc is the best to use


User avatar
W. Winget
LTC, U.S. Army
LTC, U.S. Army
Posts: 4445
Joined: Mon Dec 16, 2002 10:37 am
Location: USA, Virginia, Carrollton
Contact:

Re: More engine power in dukw

Post by W. Winget » Fri Feb 09, 2018 5:14 pm

From what I recall, the M135/M211 GMC 2-1/2T truck (recall Rambo driving one...)
Distinguishing features: Sloped hood. sides of rear bed notched up a few inches above the rear wheels, bumper might have lightening holes in it, usually hardtop. (automatic transmission)
This keeps it military, and I think is a bolt in replacement, but you still need the reverse fan and some components off the DUKW engine, possibly the flywheel.
Here's an example for 2K, but asking on the 2ton and up forum, or over on SS may yield a truck for parting out for the axles offering the engine.
http://topclassiccarsforsale.com/gmc/33 ... truck.html
Image
V/R W Winget
Looking for 1918 Standard B 'Liberty' truck parts

eaw46
G-Command Sergeant Major
G-Command Sergeant Major
Posts: 248
Joined: Thu Jan 07, 2010 4:52 pm
Location:

Re: More engine power in dukw

Post by eaw46 » Sat Feb 10, 2018 6:47 pm

That would be a good motor to install but be careful not to overpower the rest of the driveline. It gets very expensive when other components start to break. Eddy

Dodgeguy1942
G-Sergeant First Class
G-Sergeant First Class
Posts: 80
Joined: Mon Dec 30, 2013 12:58 am
Location:

Re: More engine power in dukw

Post by Dodgeguy1942 » Fri Mar 23, 2018 2:35 am

Thanks for the replies. The 302 engine sounds the way to go. Has anyone seen any for sale?

Joe Gopan
Jeep Heaven
Posts: 49841
Joined: Sun Mar 02, 2008 12:37 pm
Location: Proving Ground

Re: More engine power in dukw

Post by Joe Gopan » Fri Mar 23, 2018 3:55 am

There are Crankshaft and Crankshaft pulley, Air Compressor, Flywheel, Water pump fuel pump, intake manifold, carburetor differences to consider and the M-135/M-211 block has the fuel pump location blanked off. Also, the DUKW Oil Pan must be installed, the Deep Sump M-211 Oil Pan cannot be used. Crank Case plumbing for the Oil Pump is also different.
You are going to encounter a lot of "dead end" advice.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO

Gerben Faber
G-Sergeant First Class
G-Sergeant First Class
Posts: 97
Joined: Tue Jan 25, 2005 1:26 am
Location:

Re: More engine power in dukw

Post by Gerben Faber » Sat Mar 24, 2018 4:10 am

I have four 302 take outs available. Engines are complete,turn by hand and the auto transmission is still attached. They are located in the Netherlands. I can ship, but have no clue what the costs will be.

I use the 302 in my DUKW also, it makes a lot of difference.
Joel is right, you need to do some wrench turning before you can put it in.


8) Gerben

Dodgeguy1942
G-Sergeant First Class
G-Sergeant First Class
Posts: 80
Joined: Mon Dec 30, 2013 12:58 am
Location:

Re: More engine power in dukw

Post by Dodgeguy1942 » Sat Mar 24, 2018 4:29 am

Thanks for the replies. I'm sure the power gains would be worth it though

Joe Gopan
Jeep Heaven
Posts: 49841
Joined: Sun Mar 02, 2008 12:37 pm
Location: Proving Ground

Re: More engine power in dukw

Post by Joe Gopan » Sat Mar 24, 2018 4:46 am

The 302's were installed in GMC medium duty trucks thru the 50s and there were several Crankshaft, connecting rod, Cylinder Head Manifold, intake Port and Carburetor configurations. It's too easy to make a mistake as there is a lot of well intentioned advice. The only 302 experience I have is the 302 in the M-135/M-211 and the 302 installed in the U.S. Army 424V 1955 2 Ton GMC Commercial trucks from my Army days. Intake Manifolds with 2, 3 and 4 Bolt intakes will be an education for you. The WWII 270 intakes and heads will not fit the several 50's 302 GMC configuration.
The late Civilian 302's are no longer a common find.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO

Dodgeguy1942
G-Sergeant First Class
G-Sergeant First Class
Posts: 80
Joined: Mon Dec 30, 2013 12:58 am
Location:

Re: More engine power in dukw

Post by Dodgeguy1942 » Wed Apr 04, 2018 3:50 am

It looks like I may have found a later 270 from the fifties. Apparently 145hp?

Gerben Faber
G-Sergeant First Class
G-Sergeant First Class
Posts: 97
Joined: Tue Jan 25, 2005 1:26 am
Location:

Re: More engine power in dukw

Post by Gerben Faber » Wed Apr 04, 2018 9:17 am

Don't know about the postwar 270, but there is a rebuilt 302 engine on epay right now. The best part is that it's allready modified for use in the Dukw and for you it's located on the right side of the pond.

Dodgeguy1942
G-Sergeant First Class
G-Sergeant First Class
Posts: 80
Joined: Mon Dec 30, 2013 12:58 am
Location:

Re: More engine power in dukw

Post by Dodgeguy1942 » Thu Apr 05, 2018 4:33 am

Can't find it? Do you have the item number?

Gerben Faber
G-Sergeant First Class
G-Sergeant First Class
Posts: 97
Joined: Tue Jan 25, 2005 1:26 am
Location:

Re: More engine power in dukw

Post by Gerben Faber » Fri Apr 06, 2018 2:49 am


Dodgeguy1942
G-Sergeant First Class
G-Sergeant First Class
Posts: 80
Joined: Mon Dec 30, 2013 12:58 am
Location:

Re: More engine power in dukw

Post by Dodgeguy1942 » Fri Apr 06, 2018 12:27 pm

Thanks. Looks like it still needs some parts from the dukw's motor. Fan and air filter

Gerben Faber
G-Sergeant First Class
G-Sergeant First Class
Posts: 97
Joined: Tue Jan 25, 2005 1:26 am
Location:

Re: More engine power in dukw

Post by Gerben Faber » Fri Apr 06, 2018 1:16 pm

You can use the original waterpump of the 270 dukw engine and also the reverse fan.
The carb still has the elbow on the back for the hose to a side mounted aircleaner. I use only a long hose and put it low inside the hull behind the right front wheel.

Joe Gopan
Jeep Heaven
Posts: 49841
Joined: Sun Mar 02, 2008 12:37 pm
Location: Proving Ground

Re: More engine power in dukw

Post by Joe Gopan » Fri Apr 06, 2018 1:58 pm

Hopefully it has a matching Flywheel. The 302 has 6 Flywheel Bolts on the crankshaft.and the M-Series crankshaft is longer at the pulley. There are bound to be some surprises.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO


Post Reply

Return to “Amphibian, DUKW, GPA and other wheeled amphibian”

Who is online

Users browsing this forum: No registered users and 64 guests