Rislone Rear Main Seal Leaks

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Updated: May 14, 2019

A rear main seal leak can cause major issues to a vehicle and its transmission. Rislone Rear Main Seal Concentrate, distributed by Smits Group, is the solution you were looking for.

Most rear main seal leaks are caused by a combination of normal wear in the crankshaft and seal and the drying, hardening and shrinking of the main seal. The seal can also leak due to the vehicle being stored for an extended time, or from running the engine oil too low. This causes the drying and hardening of the seal which in turn leads to the seal shrining, cracking and possibly tearing.

Rislone Rear Main Seal Concentrate is specifically designed to seal rear main seal leaks, but it also works better than a conventional stop leak on all other leaks,  including timing cover seals, cam seals o-rings and other gaskets. Rislone Rear Main Seal Repair is a unique combination of lubricity agents, conditioners and additives that restore the seals to like new condition which are reinforced with polymers to seal leaks in severely worn seals and crankshafts.

Replacing the rear main seal in a vehicle incurs high labour bills, as replacement of the rear main seal in a front wheel drive vehicle usually requires the engine to be removed, and in a rear wheel drive the transmission usually needs to be removed.

The rear main seal fits around the rear of the crankshaft to prevent oil leakage. Also known as a main seal or rear main bearing seal, it is located between the engine and transmission. The crankshaft (the internal engine part that the pistons are connected to) sticks out of the rear of the engine, and the flywheel and transmission bolt to this crankshaft. The engine oil lubricates the crankshaft, pistons and other internal parts of the engine. The rear main seal is inserted into the back of the block and fits snug around the rear of the crankshaft and keeps the engine oil from escaping.

What Are The Symptoms Of A Rear Main Seal Leak?

Depending on the severity of the leak the first thing you may notice is the oil level going down. The next thing that happens is spotting, where you will find oil spots, located on the driveway or garage. While looking under the vehicle around the area where the engine and transmission connect, you will find oil dripping, or an oil residue with dirt caked on this part of the vehicle, most noticeably under the oil pan and the front of the transmission. In some transmissions, it will actually be oil leaking out of the front of the transmission. In some manual transmission vehicles, you may also notice some slipping of the clutch, which can occur with a leaking rear main seal

What Other Factors Can Contribute To A Rear Main Seal Leak?

A few things can cause a rear main seal leak to worsen, which are not the fault of the seal itself. If the oil level is two high (filled over the full mark) or the PCV (Positive Crankcase Ventilation) system is not functioning correctly, leaks can occur. The PCV system prevents pressure from building up inside the engine and if it fails, the pressure will cause the oil to leak out. It is a good idea to clean or replace the PCV valve regularly to prevent this problem.

Do I Need To Use Rislone Rear Main Seal With Every Oil Change?

No, once you have used Rislone Rear Main Seal to seal a leak, we have found that you can receive good results if you reuse the product every other oil change, but it is advised to keep an eye on your typical oil leak symptoms and treat accordingly should you experience any of the symptoms.

How Do You Replace A Rear Main Seal?

For most rear wheel drive vehicles the transmission is removed to replace the seal. On front wheel drive vehicles, it is usually easiest to remove the engine to gain access to replacing the seal. Either way, this is an expensive procedure.

What Else Can Be Done To Stop A Leaking Rear Seal Other Than Replacement?

Rislone Rear Main Seal Repair is one of the only products of its kind on the market specifically designed to solve rear seal oil leaking problems. There are special oil additives on the market that are designed to swell the rubber of the rear seal and cause it to expand, thus sealing off the leak. You can also try using thicker weight engine oil, like 50 weight. The thicker oil can fill in the gap between the seal and the crankshaft, and could slow the leak down.

How Does Rislone Rear Main Seal Repair Work?

This product works in two ways to help solve most any seal type leak. The seal restorer additive restores seal size, flexibility and elasticity lost due to engine heat, age and high mileage

The seal polymer works by building a polymeric film around the rear main seal, also filling in any groove worn into the crankshaft by the seal

What Types Of Seals Will Rislone Rear Main Seal Repair Fix?

Because of the Rislone 2X Action formula, the product has additives to work on any of the three types of rear main seals, no matter what the material.

What Are The Different Kinds Of Rear Main Seals?

Three basic styles:

  • Rope Seal

Also called a wick seal

  • Two Piece Seal

Neoprene or called rubber Silicone

  • One Piece Seal

Neoprene or called rubber NBR or Buna N (Nitrile) Silicone PA or Polyacrylate Viton or Fluoroelastomer

Will Rislone Rear Main Seal Repair Work On Other Oil Leaks?

Yes. Even though it is specially designed to seal rear main leaks, it also works better than a conventional stop leak on all other engine oil leaks. This includes the timing cover seal, cam seals, O-rings and other seals and gaskets.

Will Rislone Rear Main Seal Repair Clog My Oil Filter?

No. Unlike cooling system products, Rislone Rear Main Seal Repair has no particles to plug the leak. It contains special polymers and seal conditioners to stop seal leaks.

Rislone Rear Main Seal Repair

  • Stops leaks
  • Repairs
  • Cleans
  • Performance
  • Lubricates
  • Stops noise
  • Stops all oil leaks
  • Seals rear main, cam seal and timing cover leaks
  • Restores shrunk and hardened seals use in petrol & diesel engines
For more stockist or product information freephone 1800 883 888

Visit the Smits Group website at www.smitsgroup.com.au