SHIELD MASTER CYLINDER ASS
WOA647
Master cylinder heat shield
WOA647 – For early style master cylinder
Steel heat shield that protects the master cylinder against excessive heat from the exhaust manifold. This part is often missing or rusted away on restoration projects. Fits early master cylinders with forward-facing threaded mounting holes.
|
Material Steel |
Willys part no. WOA647 (A647) |
|
Type Early style master cylinder |
Mounting Firewall mounting above master cylinder |
Features
- Protects brake fluid against overheating
- Prevents brake fluid from boiling under heavy use
- Fits early master cylinders with forward-facing threaded holes
- Mounts as original, no modifications required
- Replaces often missing or damaged original
★ Correct reproduction of this often missing protective component. Essential for reliable brake operation.
Application
Willys MB (1941-1945), Ford GPW (1941-1945), Hotchkiss M201, and early CJ-2A up to serial number 215,649. Only suitable for early style master cylinders where both mounting holes face forward and one of them is threaded.
Installation notes
Mounts with existing fixing bolts between tie bar and master cylinder to the firewall. No drilling or modifications required. Check before ordering that your master cylinder is the early style version (forward-facing threaded holes). Late master cylinders from CJ-2A serial number 215,649 onwards use a different heat shield (WO-800027).
Compatibility
ONLY for early style master cylinders with forward-facing mounting holes. Willys MB and Ford GPW had this type as standard. CJ-2A up to serial number 215,649 also had this type. From CJ-2A serial number 215,649 onwards and later (CJ-3A, CJ-3B, M38, M38A1) a different heat shield was used. Not interchangeable between early and late versions.
Historical context
Developed during WWII to protect brake fluid from exhaust manifold heat, particularly during intensive use in mountainous terrain or at high ambient temperatures. This part was often removed during civilian use and is therefore missing on many restorations.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
⚠ Spotted an error in this description? Report it to info@willys.be
This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
ALL_CATEGORIES : 01 SGI BODY ENGINE COMPARTMENT
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 9-1803B — Ordnance Maintenance — Power Train, Body & Frame — only for Willys MB / Ford GPW (¼-ton 4×4)
