ACSD started leaking.

[chapel gate]

Noticed fuel leaking from the acsd the other day. Is it always the case that the shaft is worn or could i just get away with replacing the o ring?

Ive read that some do away with it completely and it works by altering the pump timing rather than putting more fuel in. How does altering the timing help with cold starting? Increases the compression?

Sooo, if i remove the system completly will i achieve the same amount of cold start help by pulling the hand throttle out to increase fuelling?

I like all of the 80s cold start goodies, some people are building there 80 for the zombie apocalypse. Im building mine for the zombie apocalypse and the impending mini ice age!

 

[Dave2000]

The ASCD does not have any fuel in it Mike other than the smallest amount IIRC for lubricant, the main fluid in it is coolant. Where it bolts onto the pump that is where the 'O' ring leaks fuel, a new 'O' ring is normally all that is needed. The device alters the pump timing, as the coolant warms the timing is altered to suit, the device has been known to cause a 'ticking' noise particularly when cold. Ultimately it can break and damage the pump I removed mine completely about 5 years ago, the coolant pipe is simply looped back to the engine.

You will find the info in my MUD thread link in sig, if you decide to go this route you will need a blanking plate.

regards

Dave

 

[chapel gate]

Isnt that the thermal wax plunger that has the coolant pipes running into it? As i understand it the plunger pushes against the ascd which then alters the timing. This is what is leaking from the shaft which goes into the pump. In what way does altering the timing help with cold start? And would adding more fuel via the hand throttle have the same results?

Cheers

 

[Dave2000]

If you retard the ignition (or pump) timing the engine will travel further during the stroke before it fires, this helps it start, the hand throttle is what it is, a hand throttle, in essence it does what your foot does and holds the throttle slightly open but of course it can be locked out, this maintains the high idle, ideal for winching for example.

regards

Dave

 

[Towpack]

The ACSD advances the diesel timing for cold starts. Advancing the timing means the engine has more time to burn the fuel which aids combustion in a cold engine. I've read/hear that removing the ACSD requires the pump timing reseting which can be a DIY job but requires special tools.

 

[Dave2000]

Hmmm, I thought it retarded the timing on the 80, I am sure when I checked the pump timing it was correct when the device was removed, and retarded when cold? Unless it was wrong to start with (pun not intended).

I could be wrong....I was once before you know ;.)

regards

Dave

 

[chapel gate]

Ok, so the acsd is a more effective cold start aid than simply putting the accelerator to the floor?

 

[frank rabbets]

The acsd advances the pump timing. As the piston comes out during warm up it gradually retards the timing until normal timing is achieved. Therefore if the acsd is removed the engine will be running too advanced when warm. There are no official figures for timing the engine without the device. (During pump timing with a cold engine a 10mm shim takes the place of the extended piston).

The plate on the pump has a rubber seal and so does the shaft. If diesel is coming out one or both seals have failed.

When you put the water pipes back on to the acsd they may well leak due to disturbed corrosion on the acsd aluminium pipes. Cleaning these pipes and the insides of the hoses is essential. The original spring pipe clips may still not be strong enough to seal so get a couple of screw thread pipe clips just in case.

 

[Dave2000]

Ok, so the acsd is a more effective cold start aid than simply putting the accelerator to the floor?

Yes.

regards

Dave

 

[chapel gate]

Thanks for the replys chaps. Think i will repair rather than slat it. Anyone happen to know the part numbers for the o ring and rubber seal?

 

[Towpack]

Just looked on the EPC and the large O ring is 22193-17840. Can't see any other seals on the diagrams. The whole ACSD unit with thermo wax plunger is shown as one part with one part No. You may have to strip it to remove the old seal/O ring and source one elsewhere, maybe a IP specialist.

 

[chapel gate]

Cheers for that towpack.

Where did you download the EPC from?

 

[frank rabbets]

Toyota don't appear to sell the spindle seal. If you take both of your seals to your local bearing stockists they will most likely be able to sell them to you. Tell them it's for diesel fuel. Or RVS Swindon will know these seals of by heart and may supply them to you.

 

[Towpack]

Cheers for that towpack.

Where did you download the EPC from?

I got the EPC several years ago but can't remember where from. It's an old version written to run on Windows 98 but will work on later OS's. It won't run on Mac so I have to run it on a separate laptop with W7.

 

[Allchin]

I have just remove the ACSD unit 'cold start' to replace the weeping 'O' ring on the spindle. After refitting it, the engine does not start! Do I need to bleed the system or will cranking the engine eventually clear the air out of the system?

Stephen

 

[StarCruiser]

Pump the fuel round with the primer on top of the filter until it gets hard to pump. Then crank it. It may be lumpy at first but it will clear then run smoothly.

 

[Brett]

I had my ACSD unit replaced by a local diesel injection workshop, luckily they are used to working with Denso pumps, it cost about £130.00 iirc, this was about 8 years ago mind you.

 

[frank rabbets]

I don't know the Toyota cost but the independent diesel shop price is about £90. They need the part number off the pump plate to order. Sometimes reconditioning the old ACSD is easy by just replacing the "o" ring but sometimes corrosion to the housing and spindle is too far advanced.

 

[chapel gate]

For the record i replaced my acsd in the end. I blanked it off and ran it for a while without but i didnt like the light pedal feel and low tickover on start up. Probably wouldnt bother most people tbh.