SDP Cat injector leaking?

When the engine fires into life after it 'stalls' does it blow white smoke initially from exhaust? And can you smell unburnt diesel? This is a good sign of an injector tip leaking. The knock could be an amount of fuel trying to be compressed and burnt whilst this is happening.

If you find a weak hole you may be lucky to of found your leaking tip. However as a leak is a mechanical issue with the injector tip, it could be unrelated. Other means will have to be used to find the faulty tip.

The only other question to ask is whether you are using/loosing coolant, as this may be another cause.

To reset instruments after this happens will not be from a faulty injector, and sounds like another truck electrical problem to me.

If the engine quits/splutters under load I would be looking at the fuel suction system. If you can place clear fuel lines before and after the primary filter you may be able to find a source of air entry. Or if you are able to connect a fuel gauge and check pressures when problem occurs. I would expect to see an erratic reading.

Hard or rough starting could be as a result of losing fuel system prime. Try replacing fuel valve under secondary filter base on engine. 1" wrench will undo this, and valve can be replaced quite cheaply.

Start with this and see how you go, good luck!

 

If it smokes white, it could be a lower injector o-ring burnt / broken. I've seen injector o-rings get cut during install lock up an engine. The o-ring would cause it to start hard after sitting as the head loses its fuel. It would also cause the hydrolocking of the cylinder. Also, w/ a 2010 Cat engine, there is more then one fuel valve in the base assuming you're talking about the regulators. One low pressure and one high pressure.

 

A cut or burnt o-ring on an injector would not allow coolant into the engine, just fuel. If you had an injector cup leaking into a cylinder, that would cause it to knock upon starting but you would notice a sweet smell to the exhaust, possibly compression in the cooling system and when the unit sat you would get some coolant in the oil showing up on the oil sample. I really do doubt that's your issue though.

 

I don't know what Cat dealer you are dealing with out there, but there should be no problem for the dealer to investigate and repair this problem before a major failure happens. (bending a rod and sending it through the sid eof the block, have seen it happen) I would contact your Cat rep and make arrangments to get this unit repaired. Over here, if a customer drives a truck to destruction, Cat my not cover the repair.

 

Find a better shop, if you're putting 3/4gal of water in a month and there are no external leaks there is already a failure, they need to find out what is causing the coolant loss, if it knocks on hot starts I'd say that'd be the first place to look for the missing coolant.