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A 414 Fuel Pump timing

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Mike414

02-15-2005 14:15:06

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Morning All,

I"ve just about finished a full rebuild on my A 414 (Australian built B 414 with a few local mods), and want to make sure I get the fuel pump timing right.

It has a AD-154 (Australian BD-154) diesel 4 cylinder engine fitted with a CAV DPA rotary injection pump. There are timing lines on the injection pump body that are adjustable in relation to another index on the front of the crankcase by rotating the pump on its mounting studs. I understand that this engine was fitted to quite a few tractors etc in the 60"s and 70"s.

I have a service manual (genuine) that says,

"fuel pump timing is fully detailed in the "FUEL INJECTION SERVICE MANUAL SM-11" and also : "AFTER AN ENGINE REBUILD THE FRONT COVER TIMING MARKS MUST BE CHECKED AND RESCRIBED AS NECESSARY. and, yes you guessed it... "THIS OPERATION IS FULLY DETAILED IN THE FUEL INJECTION SERVICE MANUAL SM-11.""

Thats great, but I dont have this manual.

So, does anyone out there have access to this manual, or the appropriate procedure?

Any info gratly appreciated..... ..... .

Cheers,

Mike.

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Opa A

02-15-2005 22:17:18

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Re: A 414 Fuel Pump timing in reply to Mike414, 02-15-2005 14:15:06

Been a while since I've timed a CAV/Lucas injection pump, bear with me. If you pull the rectangular cover off the side of the pump (held on with 2 small bolts) you will see the side of the cam ring. It will have a scribe mark on it the you can see move in the window as you turn the pump driveshaft. When that scribe mark lines up with the square end of the snapring holding the camring in the pump body, the pump will be at start of injection. You need to know the static timing mark used for setting start of injection, usually either marked on the flywheel or front pulley, not sure on a 414, but on many engine it is right at TDC. Rotate the crankshaft in the direction of engine rotation, (to take up any lash in the timing gears) until the engine timing marks line up, with #1 cylinder on top of compression stroke. At that point match the marks in the pump and lock her down to the front plate. Turn the crankshaft back 45 degrees and bring it forward again and recheck both sets of marks. Readjust if needed, reinstall window cover plate and bleed pump. Guessing on fuel pump timing and getting too much advance can be fatal to the engine if it is expected to work hard. I refuse to use the external scribe marks on the pump and front front cover, seen them out by over 1/8 inch on a regular basis. Hope this helps.

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Mike414

02-21-2005 02:21:20

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Re: A 414 Fuel Pump timing in reply to Opa A, 02-15-2005 22:17:18

Thanks Opa & JB,

My apologies for not replying sooner, but I was away at work.

I"ve got a few days off now, so I should be able to sort this out!

Just a further question, re the marks visible on the cam ring, does it matter which letter (A to H in alphabetical order) is visible? With the flywheel TDC marking aligned with the clutch hosing mark, I can see the letter E with a scribed line. By the way, all of the timing marks are correctly aligned on the gear train between the crankshaft, idler gear and injection pump gear.

Reference the snapring square end that aligns with this line, is a snapring the same as a circlip? I guess it is, just british versus american terminology.

Thanks again for your replies, a great feat of memory!

I"ll let you know how I go,

Cheers,

Mike.

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jb2

02-15-2005 18:53:16

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Re: A 414 Fuel Pump timing in reply to Mike414, 02-15-2005 14:15:06

Hi Mike414, it been almost 35 years since I replaced a fuel injection pump on a 434 which has same BD-154 as B414.
From my memory I believe there were 3 cap screws connecting the pump drive shaft to the timing gear. The timing gears should have timing marks that align. The fuel pump can be 1/3 of a turn out of time as I don't recall any marks on the pump drive shaft to align to timinig gear. This is a trial and error method of course timing. After bleeding the air out of the fuel system by using the hand pump and loosening the injector lines then if tractor won't start then rotate pump drive shaft by 1/3 and try again. Repeat until engine starts.

To do fine tuning of the timing, start off by setting the pump in the middle of the timing marks on the mounting plate. Mark a reference piont then attempt to start the tractor.

If the tractor kicks back on the starter then the pump is timed to fast and if it is hard to start then it is timed to slow.
Rotate the pump about a 1/16 inch in either until the best starting position is found.

Good luck
JB2

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