Primary Chain Oil Spray
The original design of the engine did not provide a direct oil spray onto the primary chain. This may have contributed to the early wear of chains. While modern chains are significantly more durable than those originally fitted, it is possible to add oil spray holes to improve service life of all primary chain component. Citroen fitted a spray to all later engines and was required to be done on reconditioning. In order to locate the spray correctly, the following jig is required.
OOTFAB Dual Primary chain oiling holes
The drill jig based retrofit from Citroen is one method. A far simpler method is to modify the primary cover. Consider the simpler alternative of modifying the main oil passage in the primary cover to create two oil spray holes for the primary chain. Requires no modification of engine block. Requires only an angle drill and basic measuring skills.
Holes are located at at 2 o'clock and 7 o'clock facing the interior of the primary cover (10 o'clock and 5 o'clock facing the engine block). Holes are located 15mm back from the main oil passage mating face.
Citroen retrofit Spray Hole
Citroen fitted a spray to all later engines and was required to be done on reconditioning. In order to locate the spray correctly, the following jig is required.
Use of a cardboard replica jig to show general location
An alternate set of spray holes can be added to the engine primary cover. See OOTFAB Dual Primary chain oiling holes
Picture of Spray Hole
Spray hole is circled in white
Drawings of a Citroen/Maserati-designed jig to locate a drilling site
Combined PDF: OilSprayDrillingJig.pdf
The original factory-fitted hole was 0.5mm. Citroen specifies 1.0mm in this jig, possibly because of the care needed with the smaller drill. This 'modified from the original' jig allows the hole to be drilled without completely stripping or removing the engine, and can use a 0.5mm drill.
OOTFAB made jig:
(See Marketplace:OOTFAB for more information)