Turbo Diesel Registry
Issue link: http://read.uberflip.com/i/594528
14 www.turbodieselregister.com TDR 90 TAPPING NOISE Recently, I have been hearing a melodic tappet type noise while driving my '95 Turbo Diesel with 300,000 miles. The sound varies with throttle position and sometimes disappears at cruising speed or the sound can increase depending on accelerator pedal position. gklotz My guess is the noise is originating from the lift pump. Over time the internal spring gets a little weak and the pushrod loses contact with the camshaft for a millisecond on every revolution, causing a tapping noise. GAmes, Killeen, TX Can I continue to drive without fear of sudden failure? Are these springs ever sold as a part for minor pump rebuilding? gklotz There are no lift pump rebuild kits that I'm aware of. When replacing the lift pump, be sure to replace the fuel hose as well. Normally a tapping lift pump will not fail suddenly. However, the tapping can't be good for the camshaft lobe. GAmes, Killeen, TX I replaced the lift pump, elbow hose, and upper gasket as you suggested. Your guess was correct. The noise is gone. I could tell the difference when bench testing the new versus the old pump. Thanks for your time. gklotz OIL LEAK I am having trouble with the valve covers leaking on my '96 Turbo Diesel 2500. I installed new Felpro gaskets and they still leaked so I bought new valve covers and it is still leaking oil. Has anyone ever seen this before? clong6343 Did you defeat the design by placing washers under the valve cover bolt heads? I've seen that before. It pushes the valve covers too far down and splits the gaskets. If not, make sure the gasket mating surfaces on the cylinder head are clean and dry of oil when replacing the gaskets. GAmes, Killeen, TX REPLACEMENT RADIATOR COOLING FAN I noticed a crack on one of the fan blades of my '96 Turbo Diesel 2500 and I need to purchase a new fan blade assembly. The fan assembly, part number 52004927, is superseded to part number 52028653 and both are no longer available. I do not want to replace the fan with a used one since it will also be fatigued. I also do not want to use an electric fan system as the exclusive cooling fan. I found that the fan for 2000 to 2002 model year Turbo Diesels uses a different fan blade assembly, part number 52028893AA, but it is also no longer available. I found the largest aftermarket fan that will fit on my existing fan clutch is 20-inches with six blades and is available from Summit for around $54 with shipping. Coverage of the '94 to '98 Model Trucks (12-valve engines). Web Site Correspondence Edited by Bill Stockard.