Posted by Owen Aaland on December 06, 2007 at 12:44:42 from (65.165.246.41):
In Reply to: Re: 806 fuel pump posted by Hugh MacKay on December 06, 2007 at 08:13:15:
The leak you have is from the recirculation tube. The solution is to remove the hose. You will need a new timing plate to replace the one with the nipple and either a new inlet fitting or just braze the nipple closed. Do not put the hose back on the pump.
The recirculation system was to extend the life of the filters by returning less fuel to the tank via the return line. The problem is that by not returning all the excess fuel to the tank, the pump will run hotter and this can lead to starting problems when the engine is hot. There was a service bulletin to remove the system issued sometime in the late sixty's or early seventy's. It has been a long time since I have seen an 806 that still had it installed.
The injection pump shaft seals on the 806 are not the lip style seals on the shaft as used on the 560 but rather two normal looking oil seals in the adapter housing. These seals are not disturbed by removing the pump. There is an O-ring to seal the housing to the adapter housing.
If you scribe a mark across the pump housing and adapter you can reassemble everything and not have to worry about getting it out of time. Just don't rotate the engine or pump while you have them off.
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