|water pump/oil pump oil
|Gaco DPSM 17307, 17x30x7mm
||17 x 30 x 7 mm buna N seal
|water pump shaft seal
|water pump shaft
seal face washer
|12mm x 34mm x 4mm, micro polished steel
12mm x 30mm x 4mm, micro polished steel
|shaft seal backup washer
||19.1mm x 34.8mm x
2mm, flat steel
|impeller nut, brass, acorn
||10mm x 1.5 thread x 17mm
hex x 17.5 height
|impeller lock washer
||tang to impeller slot,
bent over lock nut, .8mm thick, 10x23
|impeller key, steel
||4mm width x 4mm tall x
|Jaeger, France, 14, 12v,
M16x1.5 , H7, 82405
|water "Y" O-rings - 2ea
ANELLO D.24 OR 132
|water pump housing gasket
|water pump base to oil
|Cross section view of a P400
water pump. The stack height of all the pieces in relation to the oil
pump extension shaft is critical. The gasket thickness is critical.
Impeller alignment on the shaft is critical. The area of the steel
shaft in the water seal section, which will corrode, is not critical to
the mechanical shaft seal. The area of this steel shaft in the Gaco lip seal area is
critical to the sealing of oil.
additional information -
1) Oil seal installs with lip toward oil pump. This lip seal keeps oil pump oil from leaking.Generally requires a "bullet shaft protector tool" and lubrication to install partially assembled water pump on engine to avoid damaging this oil lip seal.
2) Water must not be allowed to leak in 3 places:
- behind the polished washer (MW-00396) as it butts up against the back of the impeller
- across the polished washer/seal face
- OD (35+mm)of the spring loaded, elastomer encased, water pump seal (GN-00632)or (08611703) in the water pump housing ID (35mm).
3) the seal face, micropolished washer MW-00396 was a large34mm diameter in early Lambo pumps and slightly smaller 30mm in later versions, but is not currently available in either diameter. The reduced diameter of the newer seal face washer is not a problem, but any change in thickness will create a problem. If you were to re-grind/repolish the face, you would want an appropriate shim and positive sealing for the new shim.