Perkins 4.212 - spot the second bleed screw ..

[gandy]

Hi,

Its a Perkins 4.212 engine on a digger, with CAV injection pump. Normally on a CAV pump there should be two bleed screws on the pump body, one which can be bled through with the lift pump first, then the second that bleeds by turning the engine over before moving on to bleed the actual high-pressure lines to the injectors.

On this engine there appears to be only one highlighted, and no second one. The engine takes a lot of churning before it starts after bleeding.

Can anyone spot the second bleed screw? Nothing looks much like it to me, and I don't want to undo something and leave the innards of the pump in bits.

Thanks in advance. I had to do an emergency bleed "in the field" literally after I ran out of fuel. It just reminded me that I've never been happy with the bleeding process, and I need to change the filters now the beast is back in the yard.

 

[Cliveshep]

Try here (Section 19): http://www.scribd.com/doc/413373/Def-90-110-WSM-book2

As an afterthought, I've generally bled out pump to injectors by loosening the injector banjos and turning the engine over, tightening each in turn as fuel spurts out bubble free. Makes a bit of a mess but then it is a digger in a field.

 

[FlorealIII]

The second bleed screw is situated just above the screw you indicated, near the top of the governor housing on the fuel injection pump. When fuel free from air bubbles issues from each vent point, tighten the connections in the following order: 1. head locking screw
2. governor vent screw

good luck!

 

[gandy]

This one .... it doesn't look like a bleed screw, more like a normal bolt or set screw ..