STRAIGHTEN UP
According to the U.S. Army, one of the best ways to ensure that your HMMWV’s engine, coolant and fluids stay cool is to keep the fins of the cooling stack components clean and straight. These fins are often bent during repair and maintenance, and when enough fins are bent the reduced air flow through the radiator and cooling stack leads to engine and transmission overheating. To help prevent this, make a fin shield from a piece of plywood. Cut the wood to the necessary dimensions to fit the HMMWV’s cooling stack over the lifting rings. Also round off the edges. Then paint the shield so it looks like something more important than just a piece of plywood, and stencil it with NO STEP. To use the shield, remove the lifting ring seals and slip it over the rings. Then lay it flat on the oil cooler frame. The rings prevent the shield from sliding off. Don’t run the engine with the shield in place: it will block air flow and lead to engine overheating... just what your nifty new shield is designed to prevent! After using the shield, replace the lifting ring seals. And, even though the shield should have protected the fins, check for bent fins anyway: If necessary, use the official fin-straightening tool (NSN 5120-00-157-2180). Also clean the cooling stack frequently, especially if your HMMWV is driven off-road, using low pressure compressed air or a low pressure water stream.
WHICH WINCH?
The 9,000-lb. winch is no longer available for the M998/ A1 HMMWV. Instead, use NSN 2590-01-456-7879 to get a 10,500-lb. winch kit that replaces the old one. Easy-to-follow installation instructions come with the package.
WHERE’S THE SPARE?
Use NSN 2590-01-525-1995 to get a spare tire carrier for ONLY these HMMWV vehicles with an airlift rear bumper:
