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When you pull the torque converter cover off. Put a wrench on all the torque converter to flexplate bolts and verify they are tight. That is a common problem. If they are tight then look real close at the flexplate for cracks.

Hot Rod was among a few magazines I waited for eagerly each month to learn about vehicles way back when. Since the DB2 injection pump retards the timing as RPM’s increase. Due to diesel fuel igniting faster as pressure and temperature increase. Increasing the temperature of the fuel will have...

Interesting idea. I had a bell ringing in my head that I had heard it before While reading the above post. I had: https://www.motortrend.com/how-to/hrdp-1009-what-ever-happened-to-smokeys-hot-vapor-engine/ This engine raised the temperature of the air and doesn’t mention the fuel. Same basic...

I think the Tach and speedometer cables are held on with nuts that a 5/8" open end wrench will break loose. Laying down and looking up will let you get them loose the first time. Then just hand tighten them so next time will be very easy. Be nice to the air psi hose moving the panel around...

I have to ask. Have you followed the steps in the -20 TM for diagnosing electrical problems? That is really the bible for these vehicles and is right on. Start where it starts with two fully charged and load tested batteries. Then, follow the steps in the -20. There is a tool called a Power...

Do you know about the screwdriver test to check timing on the 6.2? With the engine warm and running. Put a large screw driver against the advance arm on the lower passenger side of the IP. Push the arm in. Then you have to figure out if is now running better/louder, worse or just kind of not...

Just to re state that every engine is different. I have 4 6.2 or 6.5 engines that get driven just about daily. Each one starts different, sounds different and for sure runs down the road different. German and agriculture diesels have a precise tooth to tooth alignment for the camshaft to...

You have found the black hole of 6.2/6.5 Diesel engine tuning. There are no published numbers from the manufacturer to do a static timing set up, GM never put out timing specs or timing methods. Snap-On, Kent-Moore and Ford all made a timing/rpm reading machine that works on the engine. Yet...

Are you stock or with a turbo? Stock you could probably step it up to 5° or even 6° advanced. I haven't pushed my turbo motor more advanced that 3° yet. Notice that your chart is for clamp on sensor timing. Not lumy probe. Put the probe as close to the injector as you can get it. The DB2...

You don't really need that part. The probe holder is supposed to be 9.5° offset from the 0° or TDC notch on the timing tab. I just held a tape measure up to one and it is about 1/2 inch from the 0° notch to the middle of the timing probe holder. How are you going to get a timing signal? I...

Something is routed wrong then. Air from the compressor goes to the tanks under the bed. Then air is let into the airpack when you develop enough brake hydraulic pressure to cause a valve to open. That pressurized air pushes on a piston which adds to the hydraulic pressure of the brakes...

Factory is more in the middle and up high. Attached is a picture of my serpentine belt Sanden compressor mounted where the CUCV alternator would be with the Banks turbo visible below it and away from the engine some. I had a belt driven vacuum pump there for a while with no clearance issues...

I have the Nostalgia Air compressor mount on one of my trucks. I have a few GM turbo set ups to look at as well. I don’t see the trouble with putting the Nostalgia air compressor on a truck with a GM turbo. After all, GM put a Sanden type compressor on the turbo side of the engine after 1998 or...

That looks like a fun project. Enjoy.

Do a deep dive into the relationship between the compression ratio and boost for the 6.5. Lowering compression makes the engine live on constant boost compared to a stock engine that lives on 0 boost except when needed. Huge difference.

Here is the video of it taking off over my head:

I converted my Gasser M35 from a 25 amp generator to a 60 amp alternator. I had to change the pulley. Everything else mounting wise was a direct bolt on. Wiring of course was different.

FiFi was in College Station a year ago tomorrow. I went to see and hear it. South wind that day thankfully so I was able to drive around to the departure end of the runway and get a video of it taking off over me. The swapped to 2800 engines years ago to make maintenance cheaper and easier...

I went with the biggest aluminum replacement radiator I could a few years ago on my Cowdog truck. I got it from Radiator Express. They seem to be out: https://www.radiatorexpress.com/part-lookup/radiator/chevrolet/1985/k30/base/62l-v8 This place seems to have them in stock though...