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The witness marks will verify pump timing is correct only when the engine is cranking, or at low idle speed. And even that isn't true all the time, since slight wear in gear train, timing chain, and pump insides can require you to not use those marks. The theory is - if a pump is known to be...

Injection pump from a 6.5 is too big for a 6.2. Turning down the fuel delivery will not make a 6.5 pump with .31" pump-plungers, behave like the correct 6.2 pump with .29" pump plungers.

Pump timing marks don't mean much Are you sure you got the right injection pump? Sounds like you might have one too big. A 6.2 uses a .29" pump and a 6.5 uses a .31"pump. What is the ID number on your's? For example, this is a 6.2 pump - DB2829-4879 10149634 1990½ HMMWV (Military) - 1.2...

One more thing . . . I forgot to mention that somtimes, with a worn head & rotor - you can work around the problem by #1 getting the engine cranking speed faster, and #2 turing the fuel adjustment up in the pump. A 12 volt starter is designed to crank at 9 volts and a 24 volt starter at...

I've never heard the term "heat soak" and I've been a diesel mechanic for over 40 years. Regional or new term maybe? With starters, if you mean when they crank well cold, but not hot - it's often caused by overheated solenoid too close to the exhaust manifold (on some Chevys)...

1/2" of side-slop for a new chain with new gears. and . . GM allows up to 8/10" of side-slop for used. I just checked one of mine with 220,000 miles and the original chain has 9/16" side-slop. That doesn't even amount to 1/2 of a degree of movement at the flywheel, i.e. no problem. How in...

I don't know exactly what your local NAPA carries. Here in NY, the straight pipe and pre-bend tubes from NAPA are just about useless. They rot out in two years or less. Same for their mufflers. And with mufflers, back pressure is critical. If you buy a direct-fit muffler from NAPA, they will...

A 6.2 runs best at RPMs 2200 and lower. At those speeds, not much air flow is needed and the stock setup gives all the CFM needed. Thus no gain with mods. 6.2 with no turbo at max horsepower only flows 250 CFM of air into the air intake. With a turbo around 325 CFM. Now, if you do a lot of...

Generally speaking, that is not what happens when a pump gets worn. Usually with normal wear and high miles- the first thing to stop working is the fuel/ignition automatic timing advance. As it goes bad the engine starts to break up at high RPMs, especially no-load and when cold. This has NO...

I've got a model year 1987 diesel Suburban made Jan of 87, and a model year 1988 diesel Blazer made in Sept of 1987. Production numbers for all diesel Blazers made by GM, civilian and/or military. 1982 - 9438 diesel Blazers 1983 - 7176 diesel Blazers 1984 - 4230 diesel Blazers - also first...

All trucks sold in model year 1982 have unique fuel injectors that will not fit any later 6.2 ever made. The threads are different. Also all 1982 6.2 diesels have red engine blocks. 83s and later do not. 1984 was supposedly the first model year for military rigs. Something sounds fishy...

About size . . . the 6.2 diesels in Ck and later V series trucks use the same size batteries as used in gas engines. They just use two instead of one. The battery trays are also the same size as gas versions. For the diesel, there is one tray on each fender well and nothing in the AC system...

All non-turbo diesel engines have less horsepower and torque then gas engines - when they have equal bore and stroke and size. It's not a special design, they are all like that. With farm tractors that get sold by horsepower, a typical 35 horse tractor with have a 152 diesel or a 135 c.i...

I've got 28 civilian 6.2 diesel trucks, Blazers, and Suburbans. Years range from 1982 to 1992. Every one of them has dual battery trays with dual batteries - AC or no AC. The only full size diesel civilian truck ever made from 70s - 90s that has one battery instead of two is the 1st...

One comment about that fuel solenoid. Even when working propertly, they won't always make a click you can hear. Spring pressure is what shuts the pump off. When the solenoid is energized, it pulls against that spring and collapses it. Sometimes you can hear the linkage click when it...

A few addded comments. Even K5 Blazers with perfect suspensions won't alway track perfectly straight, especially with oversize tires on bumpy roads. That's due to the short wheelbase. A perfect engine might run kind of lousy when first started if it's cold. Not all good engines were...

Still sounds like air to me. Or, too cold, or fuel delivery too low? How cold is it when this is happening? Assuming the temp is over 30F, this is what I'd do. First thing I'd get a small fuel tank, lay it on the fender or roof, and hook it gravity-feed to the inlet of the filter...

I'm not sure what you are calling "bashing." There is plenty of incorrect info floating around, but reporting known problems is not what I'd call "bashing." I give the original GM (not Obama's) credit for being the the only USA automaker to build their own diesel for use in 1/2 ton trucks...

All the pumps built before 1985 had a high-failure plastid ring inside. It was eliminated in all pumps built after, and older pumps when fixed got retrofitted. If a pre-85 pump has been upgraded, it should have a metal tag with and "E" on it. I've seen pumps blamed for many problems when they...

Back early 80s, I saw many 6.2s get removed and condemned for what were really simple problems. That because of the Oldsj-350 fear. Like I said, I'm glad. I saw a few 6.2s with only 30K miles get pulled and trashed when all that was wrong was the glow plugs - or failed plastic ring inside...