13 51... Checking temperature compensator on high pressure pump (Continental) (N14, N18)

Special tools required: 

• 2 344 569

The (Continental) high pressure pump is in principle a piston diaphragm pump. Two pistons are operated by a swash plate. The oscillating movement of the piston is transferred over a special oil in the high pressure pump to diaphragms in the form of gaiters. These in turn set the fuel under pressure. The oil chamber in the housing of the high pressure pump is completely filled with oil. As the oil expands when heated, this would impair the function. To ensure the high pressure pump can work correctly in all thermal conditions there is a temperature compensator on the housing. It consists of a spring-loaded diaphragm. When the special oil now escapes due to leakage and this causes the impairment to the function of high pressure pump, any lack of oil in the high pressure pump can be checked at the temperature compensator. Any lack of oil in the high pressure pump can not be topped up. It must be replaced if it is faulty.

• Temperature compensator (1)
• Special tool 2 344 569
  Fig 1: Identifying Temperature Compensator And Special Tool (2 344 569)

  Courtesy of BMW OF NORTH AMERICA, INC.

Insert special tool 2 344 569 into temperature compensator (1) up to limit position.

Press down the pin using light finger force - without pushing the special tool away from the limit position. If the pin can not be completely pressed down, the result of this check is OK  .

If the pin goes down, the result of this check is not OK  .

For the not OK  result, the dimension at the temperature compensator is again to be measured exactly with the depth gauge of the caliper gauge. (Remove fuel high pressure pump.)