Once BlueDevil Rear Main Sealer is in your engine it will revitalize the old seals you have, restoring them to their original size, shape and flexibility permanently sealing your rear main seal leak – guaranteed! BlueDevil Rear Main Sealer is not a petroleum distillate, powder, or hazardous chemical so it will not harm your engine in any way and can stay in your engine oil until your next oil change. BlueDevil Rear Main Sealer is a specially formulated additive that you add directly to your engine oil. The good news is that BlueDevil has created a way to seal your rear main seal leak easily and permanently without costly maintenance and long projects. This is why you hear so many horror stories about the unbelievable costs of fixing a leaking rear main seal. Removing either the engine or the transmission from your vehicle is a difficult and time consuming job, usually making a rear main seal replacement a very costly project. As the crank shaft spins, it can wear down the rear main seal, especially if a low oil condition exists in the engine, or the vehicle sits for a long time between uses.īecause of its location in the engine, replacing a rear main seal includes at least removing the transmission from your vehicle, if not completely removing the engine as well. The inside of the rear main seal creates a seal on the crankshaft where it exits your engine to connect to the transmission. The outside circumference of the rear main seal creates a seal between the engine block and sometimes the oil pan as well. The rear main seal is just on the outside of the rear main bearing and it keeps the engine oil from leaking out where your crank shaft exits the engine. These bearings are called the main bearings in your engine and carry the majority of the stresses on your crank shaft. Since the crank shaft has the toughest job, it gets the biggest and best bearings to make sure it can stand up to the work load. Since the crank shaft has the piston attached to it, the pulleys with all your accessories connected to it and the flywheel which connects to your transmission on it, it carries all the forces and power your engine creates. Second, the rear main seal is a seal for the main crank shaft bearings in your engine. The rear main seal is always on the opposite the side of your engine as the pulleys and belts. So the “rear” in rear main seal refers to the seal’s location on your engine, and not necessarily relative to your vehicle. This means that the front of the engine can be facing either the passenger or driver’s side of the vehicle. With modern front wheel drive cars, and some all-wheel drive vehicles the engine can be mounted transversely in the vehicle. On a rear wheel or 4 wheel drive vehicle the engine is mounted with its front (the side with all the pulleys and belts) towards the front of the car. This can be confusing today because the rear of the engine isn’t always at the rear of your engine bay. Let’s first break down the name to see what we can learn about the rear main seal.įirst, the rear main seal is at the rear of your engine. It is buried deep, usually under a lot of protective covers, wires, hoses and unfortunately, the bell housing of your transmission. If you pop your hood and start looking around for the rear main seal, you aren’t going to have much luck seeing it. The rear main seal is a seal in your engine that is very important and usually difficult to reach. Here at BlueDevil we’re hoping to change that myth. We’ve only heard horror stories about friends who had great reliable vehicles that developed a rear main seal leak and suddenly their car was only fit for a junk yard. Check transmission fluid level and fill as necessary.Having a problem with the rear main seal in your vehicle can be a scary thing, mostly because many of us don’t entirely know what that seal is or does. Fill ball housing with about 1/2 pint of 600 WT gear oil (VT-40) through the plug on top of the rear transmission housing. Reinstall U-joint and tighten 4 cap screws that hold the collar in place. Install new ball housing gaskets (FS-125 & FS-4356 - sold separately).
F4a42 transmission rear seal install#
Drill a new hole in the tube and install the dowel pin to lock the bushing in place. Lubricate the new bushing with gear oil and drive into place. Lubricate and install the new seal (RW-5 - sold separately) with the lip facing to the transmission. Use compressed air or a thin screwdriver to remove the remains of the cork. With a punch, drive the bushing out of the front of the tube. Remove old front bushing by drilling out the old dowel pin. The bushing comes with a dowel pin for installation. This driveshaft bushing fits all 1930-1933 Chevrolet passenger cars & 1/2 ton trucks.