Chev 6.2/6.5L Diesel Engine Tips and Tricks

Discuss technical aspects of your 4WD with other owners, and share your opinions
Boundry Rider
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Boundry Rider » September 8th, 2014, 9:26 pm

Joshbates wrote:Yeh it's a 6.2 non turbo. Where is the cheapest place to buy parts for them. I'm in Adelaide so I'm not sure if there are any chev diesel specialists down here in sa. Finding it hard to find filters etc.
Well there isn't very many "specialists" per say. I've used... ah... none.
But of the few that Stormtrooper mentioned, there are opportunities for good advice. The oil filters are cheap and sourced from any speed shop, ask for bits like oil filters and timing seals spec is Holden Surburban 1992 - 1994. Other things like water pumps and thermostats there's a lot of different models and styles, rear main seals there's one for 6.2's and two for 6.5's.
Performance wise for a 6.2, providing you've got a good stable base to work with no leaks, cracks, knocks, corrosion or overheating issues. Get your injectors done, power and fuel economy are the primary concern, but you don't want diesel knock to kill your engine. Make sure your IP is in good order and use 2ST oil in the fuel, check that the timing and fuel delivery are good for your airflow. Before you set the IP, DO ALL the airflow mods required. Clean non-convoluted intake and a crisp 3" exhaust. The exhaust should go black and smokey when WOT, and not too much before. All should have the rear of heads water extraction mod also.
Best thing to do is realise that these engines are old school, and have issues. They're not like Jap diesels. The IP and injectors have a relatively short lifespan and were designed to be serviced at every 100K MILES. Using the 2ST will extend this time schedule a bit more. Almost everything is sealed with CopperMax, not gaskets. They have lousy oil pressure when hot and virtually zero at idle so keep the oil fresh, and use the good old school oil with good detergents like Shell Rimula X or Helix Diesel, with the correct CH code, not fancy synthetic crap. They like being stinking hot in summer, so keep your hoses in good nick. There's no HP until you rev it up if N/A, they like being worked hard and it's not such a good idea to turbo a 6.2 so, REV IT UP!
Go online and read all you can find in the US forums, and get an exercise book. From one cover write all the ideas you read about in the forums and organise a to do list. Flip the book and from the other cover write all the parts that you use, numbers, specifications and sources for everything- belts; hoses; seals; oils; thermostats; modded parts and all these such things. Then you've a reference to the buildup work you're doing.
Big Grey '88GQ 6.5TDV8 4"Pipe 5Sp Man 2"Body2"Spring 3.56DetroitRear/ELockerFront 35"ToyoMT's
http://www.patrol4x4.com/forum/members/ ... der-43541/

stormtrooper
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by stormtrooper » September 9th, 2014, 1:53 pm

That post deserves a +1 or a "Like"

Boundry Rider
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Boundry Rider » September 9th, 2014, 5:07 pm

Cheers Stormtrooper, this thread actually has all the info, the most informative posts to look for are by the late Les Addison. Les was a gem for information on the GM V8, and lectured us here with a hidden passion within his text.
Big Grey '88GQ 6.5TDV8 4"Pipe 5Sp Man 2"Body2"Spring 3.56DetroitRear/ELockerFront 35"ToyoMT's
http://www.patrol4x4.com/forum/members/ ... der-43541/

stormtrooper
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by stormtrooper » September 9th, 2014, 6:57 pm

I know that but I was giving credit where it is due.
Les was indeed a font of knowledge for the Chev diesel and these conversions. Oneday I will go right through this thread and copy the encyclopaedic hints and tips he posted and keep it with my troopy for when I do my conversion.

Joshbates
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Joshbates » September 11th, 2014, 9:43 pm

Thanks for the info guys. My engine pulses at 1500 rpm when coasting along. Above or below this is fine. Has done since I've owned the truck. Hasn't really bothered me too much but wouldn't mind sorting it out. Does this sound like an injector pump problem

kbad
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by kbad » September 12th, 2014, 10:09 pm

Josh contact wombats80 he has had a surging issue for a while, it has been discussed in this thread at length sorry but you might have to go through it all.

wombats80
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Surging issues

Unread post by wombats80 » September 12th, 2014, 10:53 pm

Good luck trawling through a million posts finding answers. A request, too great for admin resources, was to compile a data base using this thread. Have a look around, there are quite a few people with time on their hands ;-)

On a less serious note, to this day i have not sorted my surging issue (engine pulse) with my 6.5T 80 series. Les and i had many a discussion over the phone or via email and i asked and asked and rang him every time i thought i had a left of center idea. Because all the regular solutions provided no answers.

I had the opportunity to visit Les and we legged it down the h'way in my rig to visit Yatala, home of many things chev diesel. He admitted mine was surging bad, and i maintain to this day, it did not surge as bad it does every other time.

I still enjoy the 6.5T conversion immensely but with extra coin i'd do it again with a later model engine.

wombats80
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by wombats80 » September 12th, 2014, 11:09 pm

Still waiting for Patrick to visit Darbin one time and sort this nagging surging issue once and for all, c'mon you know you want to :-)

Boundry Rider
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Boundry Rider » September 16th, 2014, 5:50 pm

Well it'll happen, I'm definitely going on a round trip, and definitely going to stopover and have a beer at yours Danny... it's just the when....
But things are coming together well, and the big grey is going great. Now with a Detroit rear and ELocker front. Fitting a long lower arms kit and 4" shocks with dropout cones in the rear right now. And going up from 2" to 3" springs. Just put a recon G/Box in, had a tiny coolant weep from the rear LH head, and solved that with 2 bottles of Rislone. Next year heads, bigend/mains and injectors will be on the cards along with a respray and some more body mods too.
Some recent play footage at UTUbe: BigGreyBoundryRider
Put your speakers/headphones on 'cause the big grey sounds puuurfect ATM!
Cheers all
Big Grey '88GQ 6.5TDV8 4"Pipe 5Sp Man 2"Body2"Spring 3.56DetroitRear/ELockerFront 35"ToyoMT's
http://www.patrol4x4.com/forum/members/ ... der-43541/

wombats80
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by wombats80 » September 19th, 2014, 11:15 pm

Goodonya Pat, i also know one day i'll travel south enough down the West to visit u also. I love WA and always want to do more along that side. I know what you're saying, i'm always looking for that extra inch too. I take a mob of my fam out Litchfield way and travel though the park from one end to the other. On the south side Parks like to put in massive speed humps across the road - flood mitigation its called - but works as speed mitigation too which in my opinion is not a bad thing but horrific if you haven't got everything in the cargo area strapped down. Last weekend nearly had the 40L Engel upside down. Good test for suspension travel too. I knew well before this i need another inch, or more. The Cape Leveque Rd said so.
So far no leaks of any sort from my old donk. I added a provent ages back to the 6.5 which proved not much more than a restriction for the breather once the fiber media became oil soaked and then smashed oil out of the dipstick tube and nearly every seal. Later i tore out the original membrane, oil soaked, inside the provent and weaved in some stainless pot scourer around the pod. Working ok so far. Thinking i need a secondary layer, still watching some vent piping up, not contained by the mesh. I want it to be routed back into the intake but minus the oil dew. The issue is my engine has its fair share of blow by whilst retaining fair oil economy between changes.

Joshbates
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Joshbates » October 18th, 2014, 9:13 am

Hi guys. I'm having some problems with my 6.2 diesel. It's developed a knock under load. I've put new injectors in and had the timing checked. The knock is only there when accelerating. It can rev hard when down shifting with no knocking. If I crack both cylinder 5 and 7 injectors at the same time the knock also disappears. Any suggestions before I pull the head off.

Boundry Rider
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Boundry Rider » October 28th, 2014, 8:02 am

I would go an injector pump based on your info so far.
However does the knock sound change when you lift the revs? If when you crack these lines and the knock disappears, when you lift the revs are there any other noises or does the knock reappear?
Are you consuming coolant at all?
It's hard to diagnose knocking when you're not present.
Cheers
Big Grey '88GQ 6.5TDV8 4"Pipe 5Sp Man 2"Body2"Spring 3.56DetroitRear/ELockerFront 35"ToyoMT's
http://www.patrol4x4.com/forum/members/ ... der-43541/

wombats80
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Re: Chev 6.2 Knock

Unread post by wombats80 » October 31st, 2014, 11:10 pm

There's a knock under load and no load, could be a big end wanting to hop out of bed. Lack of maintenance (LOM) is usually the biggest killer. You cant crack an inj line and then put the engine under load. You can, but lots of diesel fuel goes everywhere around your test drive. My 6.5 knocks a bit but mainly when cold. In Darbin we dont really get cold but at start up is the worst for creaks and rattles. I thank my guru-engine-prep-bloke for adhering to the blueprint. There can be so many variables, that maybe it was not his fault i have piston slap on a couple cylinders, in so few klms and in such tropical conditions as ours.

Cwalker12578
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Cwalker12578 » November 1st, 2014, 11:24 am

Hi all, I am new to the forum so any advice is gold.
I have had a conversion on my 80 series 1994 4.5 efi auto changed out for a 6.2 ltr chevy 379 naturally aspirated donk.
I used marks adapters and engine mounts and while the donk was not in the vehicle I had it stripped down and rebuilt.
Needless to say it drives with balls and I have not had an overheating issue yet.
The issue evident seems to be two part
1 no tacho signal or tacho is not registering.
2 the standard auto seems to not lock up or maybe it's not changing into fourth gear???
I know these autos are electronic so is there a way to solve these two in one move.
Any advice or direction to older posts would be awesome.
Thanks in advance.
Cam

Boundry Rider
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Joined: October 31st, 2010, 1:47 am
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Re: Chev 6.2/6.5L Diesel Engine Tips and Tricks

Unread post by Boundry Rider » November 5th, 2014, 10:05 pm

Bought one of these tachs. Pretty happy so far.
https://m.youtube.com/watch?v=HhLPAPZxNsM
Big Grey '88GQ 6.5TDV8 4"Pipe 5Sp Man 2"Body2"Spring 3.56DetroitRear/ELockerFront 35"ToyoMT's
http://www.patrol4x4.com/forum/members/ ... der-43541/

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