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BMW Mini Cooper
Classic Mini crankcase air breather kit mechanical fuel pump mounting

Classic Mini crankcase air breather kit mechanical fuel pump mounting

Classic Mini crankcase air breather kit mechanical fuel pump mounting
Only 1 Left in Stock!
Internet Price $49.95
Part No: C-2A265
Only 1 Left in Stock!
Internet Price $49.95
Crankcase Breather The A-Series engine has a reputation for leaking oil and/or smoking. One of the major causes of the various leaks is uncontrolled crankcase pressure. Remember that after the piston moves up in the block to create compression it also has to go back down in the block- this creates crankcase pressure. And if the piston rings are a little worn the ever present blowby can create considerable crankcase pressure. Mini Mania has developed an easy answer-an additional breather. This adapter block is designed to bolt onto the backside of any block that has a blanking plate where the mechanical fuel pump is sometimes located. The block provides baffled venting and has a 3/8-18 pipe thread output to allow you to create your own catch/vent system. Machined from billet aluminum and very trick looking!
As well as the adapter block, the kit contains:
2 * CAM6657 gaskets
2 * HC0518 bolts
2 * WL2051 lockwashers
Available only from Mini Mania!

Mini Mania Crankcase Ventilation Kit, C-2A265

Read all instructions thoroughly and check parts list before starting

This kit provides an internally baffled housing which enables the fuel pump port on the engine block to be used to vent the crankcase. The kit also includes fasteners and gaskets to mount the fitting but does not include a hose fitting and hose.

The fitting is tapped to accept a 3/8-18 NPT fitting. Fuel/emission hose of 5/8" ID is recommended and clear plastic tubing is readily available, but an equivalent size AN line can, of course be used. Whichever type of line is used, it is important that the line running between the fitting and its destination (air cleaner, catch tank, etc.) not form a loop or "sump" below the level of the fitting you've installed. If this happens, oil can accumulate in that loop and be blown out as liquid by crankcase pressure. As you might imagine, this could make a mess of things under the hood.

This kit may be used with any "A" series engine having an engine block with provision for a mechanical fuel pump.

We further recommend that some sort of "catch tank" be installed for the hose to drain to. This tank is need not be anything special, an old radiator overflow bottle or a second window washer bottle would be ideal. They are generally mounted on the firewall or some other appropriate location which allows it to be easily emptied. The tank should be vented so that no pressure buildup is possible.


Afix a 2A113 gasket to each face of the 3A0012 Vent Housing. The use of a contact-type sealer such as "Gaskecinch" (available through Mini Mania) is recommended.

Remove the fuel pump blanking plate and retain. Remove the two attaching studs from the block and remove old gasket and residue from both the blockand plate.

Position the plate over the face of the housing having a rectangular cutout and attach this combination to the block with the fasteners provided. Refer to the illustration.

Install your choice of hose fitting in the housing using (preferably) Teflon thread sealer, attach the hose and complete the plumbing.


Parts List for Breather Kit (C-2A265)

Item               Part No.               Description         Qty/kit

1. 3A0012    - Vent Housing                                           1                        
2. 12G3494  - Gasket, fuel pump                                   2                        
3. HC0518   - Bolt, 5/16-18 x 2.25" gr5                          2                        
4. WL2051   - Lockwasher, 5/16"                                    2

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