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1. Willys L134 Engine Serial Number Pad
2. Willys L134 Engine Serial Numbers Lookup

Willys 641087 (transition) CJ2A Block. Willys 641087 CJ3A Block. Willys 641087 M38/MC Block. Willy 804380 M38/MC Block. L134 Engine Block serial numbers: Post Reply. The casting is a very common gear drive version used in nearly every Willys vehicle during the late 40s to early 50s. The Willys engine serial numbers do NOT match the jeep's data plate serial numbers, nor the frame serial numbers, even if it is the original factory installed engine that is still in the vehicle. This is because Willys engines were taken out of the production line as needed and put into portable power generators, searchlight units, and welders.

To Engine S/N 44417: Type: Planetary Gear: Drive: Camshaft Gear: Minimum Save Oil Pressure @ Idle: 10 psi. Relief Valve Opens: 25 psi. Normal Gauge Reading: 50 @ 30 mph. Engine S/N 44417 and On: Type: Internal Rotor: Drive: Camshaft Gear: Minimum Save Oil Pressure @ Idle: 6 psi. (35 mph.) 20 psi. Relief Valve Opens: 40 psi. Q: Do you have any new engines for a 1950 Willys CJ3A, and if so how much? A: There is no such thing as ‘new’ engines but we have alot of options. Please call us toll free. Q: Hello, I’m looking for a MB engine (block) with a serial number between MB160000 and MB160999. A: Please call us toll free. It’s a Willys L-134 complete fan to flywheel, and oil pan to carburetor with brown bakelite distributor cap But what I need help with is identifying what year this engine is serial numbers On top of block behind water pump 2 (that’s right 2 and just 2) In small oval behind oil filter MB 628776 On lower passengers side of block 638632 W5A NI-CR. 4LR serial number prefix engines were Willys factory replacement flat 'L' head short blocks. I am going to go out on a limb and say the 4FR prefix engines were factory replacement F head short blocks.

At first glance, the Willys MBandFord GPW look identical in appearance, but with closer observation,hundredsof differences can be found. This page will point out the majorandmost obvious differences only. The purpose of page is to aid youin determining which model W.W.II jeep you have.
It is important to know that thepartsused on Willys MB and Ford GPW jeeps are completely interchangeablemechanically. When your jeep left the factory it was either 100% Willys or 100% Ford,but from that moment on, motor pool mechanics, government rebuilddepotsand civilian owners have been swapping parts without regard to whetherthe part is a Willys or a Ford part. This means that thejeepyou have is likely a combination of the two types. Often jeepownerswill refer to their vehicle as a 'GPW with an MB motor' for example.
What this means is that in order toaccurately identify your vehicle, you need to look at many clues. Generally the vehicle is divided into three major components: thechassis,the engine and the body (also referred to as the 'tub' on jeeps).Ideally,you will find that your jeep will have matching engine, frameand tub. This is often not the case. The sections that followwillhelp you determine the manufacturer of your engine, frame, and tub.

Engine Block
This one is easy. Examine theserial number stamped on the engine (see serialnumber page for location). The number prefix will tell youthemanufacturer. Willys engines have numbers that start with theletters'MB' (MB123456) whereas Ford engine numbers usually start with'GPW'(GPW123456)
If your serial number is not locatedas shown on the serialnumber page, then you probably have a post-war replacement orcivilian engine block in your jeep.

Willys L134 Engine Serial Number Pad

Frame
The easiest way to distinguishbetween the two frame types is to inspect the front frame crossmemberthatis beneath the radiator. The FordGPW frame uses an inverted 'U' shaped steel member here. It is openon the bottom. The WillysMB frame has a steel tube or pipe type member in this location.
Another detail to check is themachine gun mount. In the center of either frame, mounted to acrossmemberbehind the transmission, is a large, roughly circular plate withfour holes drilled in it . This is the machine gun pedestalmount. Only W.W.II jeeps have this feature, and all W.W.II MB/GPW jeeps wereequippedwith this plate. The plate differs in design between Fordand Willys and can be used to identify the frame if the frontcrossmemberis missing.

Body or 'Tub'
This is a more complex determinationowing to the variations in bodies used throughout the war. Before late 1943 Willys and Ford used separately manufactured bodies. Startingin early 1944 one manufacturer (American Central Manufacturing Co.)beganbuilding bodies for both Ford and Willys. These bodies arereferredto as 'composite' bodies because they have characteristics of theearlierFord and Willys bodies combined into one body type. It is recommendedthatyou consult a reference book (see the Howto Get Started page) to pinpoint exactly which body type youhave.
It is possible to identify certainbody characteristics that are associated with either Willys or Fordhowever. Starting at the rear of the vehicle: The early jeeps had themanufacturersname stamped into the left side of the rear panel, eithera script 'Ford' or a blockletter 'Willys'. This practice was discontinued early in the war(bymid 1942).
Moving forward to the rearwheelwell toolboxes:Ford bodies have a rectangular depression where the toolboxlockbutton is installed, Willyshave a circular depression here. (note: composite bodies have acirculardepression also) Another toolbox difference was in the toolboxlidsor covers. The Willys MBuses a plain flat cover whereas the Fordhas an embossed lid.
One more significant detail are thetoeboard gussets. These can be viewed under the hood. Theyare the roughly triangular braces that extend from the firewall down tothe frame. Fordstyle gussets have rounded corners and have 3 large holes in each.(note: these style gussets are also used on composite bodies) Willystoeboard gussets are very angular and flat-sided with five holes ineach.
If your body has round toolbox lockbutton depressions (like a Willys) AND it has rounded, three-holedtoeboardgussets (like a Ford) then your body is probably a composite type asdescribedabove. A composite body installed by Ford on a GPW would haveFordtype bolt-on items attached to it (embossed tool box lids, for example)whereas a composite body installed by Willys on an MB would have Willystype bolt-on items attached to it (plain toolbox lid, for example).

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Willys L134 Engine Serial Numbers Lookup