AEC 505 fuel pump timing

[Cab-over Pete]

Aye-up,

I know, a bit different for TFF.

I have an AEC 505 engine we are rebuilding.

We either need a special tool to time the fuel pump or the knowledge to get round it.

Can anyone help??

Cheers, Pete.

 

[Kevtherev]

Bet you can spill time it pete you just need a swan neck injector pipe.
Plenty of old time mechanics about

 

[Netherfield]

The old Routemaster bus forums are the place for information on this one, or maybe 'classic and vintage commercials', possibly 'trucknetuk.com'.

 

[Netherfield]

http://www.ebay.co.uk/itm/GUY-BIG-J6-SERVICE-MANUAL-AV505-ENGINE-/250965443541

 

[Cab-over Pete]

Thanks for that. We have an AEC manual but it just says about using the tool.

I've had a look on the bus forums and got a couple of numbers to call tomorrow

 

[Mursal]

Inline or rotary pump?

 

[Mursal]

Seems to be rotary ...................
If so, timing mark on the flywheel, it will be about 15 degrees before Top Dead Center on Cylinder No:1 and No:6 cylinders.
No:6 will have both valves open, No:1 both will be fully closed.
If you have no marks you will see a triangular mounting point on the bell housing for a tool, look into the hole in the mounting and watch for a dowel hole coming round in the flywheel? the first one will be injector timing. If you miss it, the next one will be Top dead Center. Set the engine with the injector timing dowel hole in the middle of the opening. This is where the tool should lock the shaft.
On the pump, take the fitting off, for No:1 cylinder and carefully rotate until you can just push a copper wire in to the outlet, telling you that No:1 has just lined up with the outlet. Do it a few times, and mark the shaft to pump housing.
Fit the pump and you should just be able to get the copper wire in at point of injection on the crankshaft.
Tighten up ...........
Rotate everything clockwise at the front .............

 

[Netherfield]

Sounds simple when you say it like that @Mursal

 

[Mursal]

These lads seem to have found timing marks on the flywheel click

 

[Cab-over Pete]

Thanks for all that, much appreciated, but I don't think that's what we need.

The tool fits into a small aluminium housing that bolts onto the back of the compressor. That housing has the lift pump bolted to the top of it and the injector pump bolted onto the back of it.

From the manual, you have to set the tool into that housing before you fit the compressor onto the block. This ensures the compressor, lift pump and (after removing the tool) CAV rotary pump are all in time, because the injector pump fits on a master spline so must be correct.

As far as I know there is nowhere on the flywheel for a tool to fit but there is a timing mark.

 

[Kevtherev]

Is there any degrees on the flywheel timing mark before TDC?

 

[Cab-over Pete]

There are, but I'm only passing spanners so I don't know the details. Chief Gasket Maker and Parts Washer, that's my role.

Matt knows what he's doing with engine rebuilds but it's making him scratch his head.

 

[Netherfield]

I've lifted this from the 'ROOF' forum,


The AEC manuals are naturally very specific about pump timing. Care needs to be taken that the correct imformation is used. AEC engines use a variety of pumps and timings. Which is no doubt the reason for LT deciding that they would mark everything for TDC. In this way their many only semi-skilled fitters would be unable to get it wrong.
In particular, the individual make and model of pump fitted and the engine onto which it is going determine whether, for instance: 14 21 23 24 25 27 or 28 etc degrees is correct. The type and size of flywheel also effects this too. One needs to read the pump code and know the diameter of the flywheel and whether the flywheel is marked in degrees, inches or hopefully injection no 1.

It seems there are not only different pumps,which I assume means inline or rotary, but different flywheels with different markings as well.

Seems a bit like the VW 2.6 6 cyl diesel engine, without knowing how you'd never be able to work it out.

 

[Cab-over Pete]

I'm no expert, but that sounds bad news.

I'm told there are a pair of brothers near Mansfield who rebuild AEC engines. Any idea who?

 

[Kevtherev]

Anyone in the classic lorry magazines pete?

 

[Timo@hattonfarms]

Steve Mayle and his son Johhny rebuild classic lorries there from Mansfield could be them? Don't have anymore details I'm afraid. Steve Mayle has a lot of videos on YouTube you might be able to contact him through there Pete

This is his channel

 

[Cab-over Pete]

That's him Tim, thank you.

 

[Netherfield]

Aecsociety.com

 

[Mursal]

Just a pity, everything wasn't marked with a center punch on the tear down.

 

[Cab-over Pete]

Yes, I suppose that's the benefit of experience. I have virtually zero, Matt has none of AEC, although several engine jobs under his belt.

I'm confident he'll get it right.

I have asked on the AEC forum but not received and answer yet.

I've got several leads to go at in the morning.