Diesel engine bleeding: -- question

[CaptainBob]

No worries Sam!

Would this be a suitable bulb pump?

http://cgi.ebay.co.uk/NEW-rubber-pr...at_Engines_EngineParts_SM&hash=item3cb2f8b8c3

Presumably I could actually use it to bleed the system all the way up to the final bleed screw? Avoiding the need to use the near useless manual lift pump?

 

[nmeyrick]

Capt Bob, I have a similar setup on my Perkins 4108 with the CAV primary filter above the level of fuel in the tank. As you say operating the lift pump with the bleed screw on the CAV cracked only succeeds in drawing air into the system.

What I end up doing then is leaving the bleed screw closed and operating the lift pump, which is pretty large capacity so doesn't take many strokes to fill the filter. Obviously this draws air into the engine, but it is a simple enough job then to bleed the injectors. I'm sure this is not recommended protocol but it seems to work fine on my engine.

My top tip when bleeding injectors is to wrap a piece of paper towel around the cracked union whilst cranking; this catches the fuel and gives a clear indication that fuel is coming from each injector

 

[prv]

Would this be a suitable bulb pump?

http://cgi.ebay.co.uk/NEW-rubber-pr...at_Engines_EngineParts_SM&hash=item3cb2f8b8c3

Probably, yes, as long as the "diesel" in the eBay description is accurate. It looks similar to mine, except that it has plastic hose barbs where mine has metal.

Presumably I could actually use it to bleed the system all the way up to the final bleed screw? Avoiding the need to use the near useless manual lift pump?

Up to the last thing before the injection pump - I don't know the Beta engine so don't know what that is . I then need to bleed the injector pipes, but you said yours was self-bleeding there - very convenient!

Pete

 

[ChiPete]

Cracked it! And I don't mean the block

I delved into the Yamnar service manual and it made it clear how it works with the 3YM20. The low pressure side is bled as far as the primary fuel filter and that's it. The high pressure side bleeds automatically.

It then takes a couple or three cranks and it'll fire to life. Simples! Must remember to RTFM earlier in future!

Thanks for all the responses to my earlier query, if anyone needs a copy of the service manual for the series, let me know. I've tried to find the link I downloaded it from but it seems to have disappeared.

Cheers,
Pete