Unusually high EGTs after a full engine rebuild?

[threedogs]

http://www.nissanpatrol.com.au/forum...e-of-a-rd28eti
Have a read of irish stevo's problem

[SiberianPatrol]

http://www.nissanpatrol.com.au/forum...e-of-a-rd28eti
Have a read of irish stevo's problem

I read through the thread, but everything on mine is mechanical and I run the MAF unplugged anyways b cause the injector pump is mechanical. Thing is, everything on mine is brand new - turbo, pistons, rings, etc. I'm going to get the shop to put back the mechanical lifters on Monday, and we'll see from there how it goes. I'll have about a week to get it sorted once they replace the lifters. Hoping the swap will make the difference. If non, I'm sunk.

[threedogs]

Im struggling to see how a set of lifters can cause your motor to
have high EGTs. Somethings not quite right Imo

I take it you cant get your Patrol Dynoed over there??

[SiberianPatrol]

Im struggling to see how a set of lifters can cause your motor to
have high EGTs. Somethings not quite right Imo

I take it you cant get your Patrol Dynoed over there??

Well the lifters are the only thing that aren't original equipment to the Patrol. Per Kimbo's post it changes the valve timing resulting in a loss of power which is what I am experiencing. The engine is revving high with a loss of power going up an incline. Ill out the lifters back to factory specs hen continue troubleshooting from there.


1999 GU RD28Ti; mechanical injector pump, 5kBt Webasto circulation heater, 33" Yokohama Geolander I/T, SaaS boost & EGT gauges, 2" Ironman suspension...more to come

[SiberianPatrol]

I could probably come up with a dyno somewhere around here, but finding a dyno with experience in diesel tuning would be next to impossible.

[SiberianPatrol]

Ok, an update on the situation. I have it booked for Monday morning for the mechanic to look at and replace the lifters with the stock lifters with shims. In the meantime, I decided to fit my boost controller just for grins and giggles to see what it would do. I set the controller to about 5-7psi cruising @100kph and boosting up to 15psi under full load. (Factory defaults are 5psi @100kph and 10psi under full load)

Took it for a drive out to the big hill again and this time it climbed the hill with almost no difficulty. EGTs maxed out at 400C post-turbo (don't know if that's too high or not) under full throttle and I took most of the hill in 5th and only downshifted to 4th about 3/4 of the way up the hill. Felt like it could accelerate slightly up the hill in 4th, but the change was huge from the stock setup.

This still doesn't "fix" the problem as I never ran the boost controller before my engine rebuild and it would take the hill without problem. I guess we'll see what the mechanic says on Monday and go from there.

@threedogs & @Kimbo63 any suggestions now based on these new findings? Anyone else care to weigh in?

[Stropp]

400 is pretty good, 550 is about as high as you want to go but not for prolonged periods.

[SiberianPatrol]

400 is pretty good, 550 is about as high as you want to go but not for prolonged periods.

Thanks, Stropp. Problem is, without the boost controller, the EGTs keep climbing past 500C on that hill. It never did it before, so I've still got some sorting out to do.

[Stropp]

Thanks, Stropp. Problem is, without the boost controller, the EGTs keep climbing past 500C on that hill. It never did it before, so I've still got some sorting out to do.

Are you sure you are not getting too much fuel? As that can cause high get temps, more boost will lower temps

[SiberianPatrol]

Are you sure you are not getting too much fuel? As that can cause high get temps, more boost will lower temps

Doesn't appear to be but that will be checked on Monday as well.


1999 GU RD28Ti; mechanical injector pump, 5kBt Webasto circulation heater, 33" Yokohama Geolander I/T, SaaS boost & EGT gauges, 2" Ironman suspension...more to come