[Mattster]

Got my first Diesel yesterday. A 1982 Chevrolet K5 Blazer with the 6.2L diesel. I can say so far I am satisfied with diesel the mpg is much better than a 5.7L gas engine would give me but it lacks alot of power....for now. Planning to either swap the 6.5 Turbo stuff onto it or a 6.5L Turbo engine itself into my blazer. Dont know alot about diesel engines yet but just reading other topics on here I have learned quite a bit and am willing to learn more.

My 6.2 sometimes sounds like it has a knock similar to a gas engine but im not sure though it only does it sometimes, so I checked the oil and put more into it since it was low but im not sure if the sound i am hearing is just the engines normal sounds or an issue that needs to be fixed. The engine has 198000 miles on it though.

 

[ratlover]

:welcome: I'm going to move this to the 6.2 forum.....hopefully you will get some good answers there

 

[the_other_matt]

hello from down the road

after you have grown accustomed to the good noises, you will be able to better pick out the bad ones

watch your oil pressure. if it stays strong, probably nothing to worry about. most often the knock you think you hear is actually injector pulse or the pump.

the 6.5 turbo swap is easy...if you don't have AC. lots of info about that here. i wanted to do that first thing to my 'burban, but after many miles of driving it i have decided to go with cowl injection and keeping it naturally asperated.

quick power can usually be found by setting the injector timing correctly. dont know why, but almost every 6.2 i have seen in this side of the state has had the timing retarded.

have fun!

 

[Mattster]

Its more of a tick than a knock. It has AC but the compressor went out so there isnt a belt on there and I can careless for AC so if I do the 6.5 turbo swap it wont be a big deal just got to fix the motor on the door so I can roll the window down that is AC to me. Definatly going to mess around with the timing a little and some of the other little tricks but I need to find a manual that covers this engine because I dont know where everything is yet since Im used to gas engines.

Oh yeah oil pressure is anywhere from 20 to 40 as its normal pressure. Going to do an oil change tomorrow and put in some lucas oil stabilizer and Castrol 15w-40.

 

[the_other_matt]

please please please use a good diesel oil. try delo and a fleetguard filter from napa...change your fuel filter to a fleetguard too while your in there. down the road, you will thank yourself for the extra money spent.

20-40 for the oil pressure is fine. mine is usually higher than that though.

timing is set with the injector pump. you will see a line "scribed" into the timing cover, and a matching line on the pump housing. making them line up is 0*, the most power is between 3*-6*BTDC. translates to about one line width or so to the driver side.

the issue with the AC and the turbo is the downpipe. the turbo mounts basicly on top of where the condenser box sits and the downpipe will go the rest of the way back. you can remove the condenser but it gets unsightly when you do.

where are you at in WA?

 

[Mattster]

Im in Port Orchard over between Gig Harbor and Bremerton. This is my wheeling rig.

What exactly do you do to change the timing on these? Sorry for noob questions since I am new to diesels, gas engines are obviously different.

 

[the_other_matt]

i used to have a lot of friends out there! i just moved from tacoma to marysville...

timing is easy. remove the air cleaner and look straight down at the injector pump. (its the big thing with the throttle and TV cables on it...has 8 steel lines coming out of it) you should see the lines i was talking about. there are 3 15mm bolts holding the pump on, loosen them and move the pump till the line is where you want it...then tighten it back up. easy peasy!

 

[Mattster]

Cool, Ill tinker with it tomorrow while im changing the oil and such.

 

[High Sierra 2500]

Welcome to the forum! :welcome:

I'm not sure how I missed this thread earlier, but apparently I did... ):h

I wouldn't worry about the knock. If it is bad enough that it is easy for anybody to distinguish from the normal diesel rattle then you can worry about it, but as long as it is hard to tell if it is knocking or not don't worry about it. These things make all kinds of strange rattling/knocking/clattering sounds...

Be careful messing around with the timing. Retarded too far is all right (will just make it smoke a bit), but advancing it too far isn't good. Advancing the timing will make more power, but you need to be careful so that you don't advance it too far.

What I would recommend doing for more power instead of advancing the timing is getting a less restrictive air intake and exhaust and turning up the injection pump fuel output to match the increased airflow. You will probably also want to eliminate the EGR/EPR system as well. These things will really help increase the power output of the engine.

Enjoy your new truck! Welcome again! :welcome2:

 

[Mattster]

What size exhaust is ideal for these? It has 2" pipes on it currently I was thinking 2.5" exhaust would really help out. And Im already working to help the intake system since the way they designed it doesnt really help it much. I was looking at that dual intake mod someone did and was thinking of doing that but im not sure I could make something like that, im not good with fabricating my own parts just yet. But i was thining of cutting of the muffler thingy on the intake and running just a tube to the front instead to give it better flow.

 

[the_other_matt]

2.5 is about the max on the stock manifolds...anything else is just show as the collector is only 2.5" :h

i am planning on running my dual 2.5"s into one aluminum 4" or 5" (my guy has both pipes already so i just have to choose)

the air muffler is a great start, but you wont notice if the timing is retarded too far...just smoke. also no sense upping the IP pressure if the thing is dumping the fuel too late...just more smoke.

its still cold enough out, flip the lid on your air cleaner and see if you get more power

 

[High Sierra 2500]

2.5" or 3" pipes are great. Make sure that you get good, open mufflers as they will make as much (or more) difference than the pipes.

There are many different ways to modify the air intake. Just removing the air muffler will help some. Don't remove the intake at the front that is mounted to the radiator support, though... That is there to keep water out of the intake (which is very important on a diesel).

Hope this helps!

 

[High Sierra 2500]

but you wont notice if the timing is retarded too far...just smoke. also no sense upping the IP pressure if the thing is dumping the fuel too late...just more smoke.

:exactly: My point was mainly that it isn't good to advance the timing too far. Having it advanced far enough is important for power output, though...

 

[okeydokey]

and i wouldn't adjust your timing with the truck running, it isn't like a gasser.

 

[Mattster]

Well thanks for the help got a nice list of stuff to start putting together. Definatly going to up the exhaust to 2.5" pipes and find some mufflers that will hold up well and sound good. Intake is a cheap upgrade since I can make most of it out of cheap stuff.