HIGH SPEED,HIGH HEAT MARINE ENGINE BEARINGS If you're looking for longer life and better performance, we recommend our High Speed,High Heat style bearings. These bearings feature a non-metallic retainer available in either a Polymite Plastic (TH9) or Phenolic Fiber (THB) which provides the following benefits: 1- Non-metallic retainers are generally moulded resulting in a one piece construction which allows them to run at higher RPM ratings then the standard replacement type bearings. 2- Boca Bearing's Non-metallic style retainers provide increased protection against corrosion. 3- Non-metallic retainers feature a C3 fit which allows for heat expansion around the balls for freer ball rotation. We recommend the Phenolic style retainer as your first choice (if they're available) and the Polymite Plastic as an alternative.
DIMENSIONS BOCA'S PART NO# PRICE-EACH ENGINE SIZE 7x19x6 MR607-Z THB/C3 $13.95 CMB21 Front,CMB45 Front,Force21 Front,NovaRoss21 Front,OPS21,45 Front,OS21RXM Front,OS21RZM Front,PiccoP5 Front,Picco45 Front,Picco45EXR Front,Thunder Tiger21 Front, 8x19x6 MR698-Z TH9/C3 $13.95 Rossi45 Front, 8x22x7 MR608-Z THB/C3 $13.95 CMB45Cam Front,CMB90 Front,OS46VRM/VXM Front,Picco67EXR(Old) Front,Rossi65 Front,Rossi90 Front, 10x26x8 MR6000-Z THB/C3 $16.95 CMB67 Front,CMB67 Front,CMB80 Front,OS46VRM Rear,RussianK90 Rear, 12x24x6 MR6901-Z THB/C3 $17.95 Force21 Rear,OPS45 Rear,Picco45 Rear,Picco67EXR(New)Front,Picco80EXR Front,Picco Hydro90 Front,Thunder Tiger21 Rear,K&B 3.5OB Old Rear,K&B 3.5 Rear,K&B 7.5 I/B Rear,K&B67 Front,K&B67/82 "NEW" Front, 12x28x7 MR16001 $17.95 OS46VXM Rear,OS65VRM Rear,OS81VRM Rear, 12x28x8 MR6001-Z THB/C3 $17.95 CMB45Cam Rear,CMB90GP Front/Rear,Homelite30cc Front,OPS90 Front,Rossi65 Rear,ZenoahG23 Front/Rear, 13x24x6 MR6901/13TH9 $17.95 OPS21 Rear,OS21RXM Rear,PiccoP5 Rear,K&B 3.5 O/B Rear, 15x28x7 MR6902 THB/C3 $17.95 Rossi45 Rear,K&B67/82 Rear, 15x32x8 MR16002 THB/C3 $19.95 Picco67EXR(Old) Rear,Picco67EXR(New) Rear,Picco80EXR Rear, 15x32x9 MR6002-Z THB/C3 $19.95 CMB65GP Front,CMB67 Rear,CMB80 Rear,CMB90 Rear,Picco Hydro 90 Rear,Rossi90 Rear,K&B67/82 "NEW" Rear, 17x30x7 MR6903-Z THB/C3 $23.95 K&B 7.5 O/B New Rear,K&B67 O/B Rear, .250x.625x.196 R4-Z TH9/C3 $12.95 K&B21 Front,K&B 3.5 O/B Front, .375x.875x.218 R6-TH9/C3 $12.95 OPS67,80 Front,K&B 3.5 IB New Rear,K&B 7.5 I/B Front,K&B 7.5 O/B Front, K&B67 O/B Front, .375x.875x.281 R6-Z THB/C3 $16.95 OS65VRM Front,OS81VRM Front, .500x.125x.250 R8 TH9/C3 $14.95 OPS67,80 Rear,
LISTED BELOW ARE ANSWERS TO THE MOST FREQUENTLY ASKED QUESTIONS THAT DEAL WITH THE INSTALLATION AND CARE OF YOUR BEARINGS AND ENGINES. 1-When the fuel is acting as a lubricant, the large crankshaft bearing shouls be open on both sides. The small crankshaft bearing should have one shield left in place, whenever possible. 2-When installing High Speed,High Heat non-metallic bearings, face the black or brown sides toward each other. 3-When you receive bearings with two metal dust covers (ZZ) the recommended method of removing a shield is to take an awl or sharp metal pointed tool, punch down lightly on the shield toward the outer race, then lift up. Please note that punching down too heavily may cause internal damage to the bearings. 4-Removing old bearings is best accomplished by heating the housing containing the bearings in a conventional oven at 350 degrees F. for approximately 5-10 minutes. Since most housings are made of aluminum they will expand at a faster rate then the bearings allowing the bearings to drop out of the housing with little or no effort. It may require some light tapping. You should repeat the process if you do not succeed at your first attempt. DO NOT USE EXCESSIVE FORCE AS THIS MAY CAUSE DAMAGE TO BOTH THE BEARING AND ENGINE. 5-Installation of new bearings should take place at the same session you're removing the old bearings,as the housing will still be hot. We suggest placing the new bearings in a ZipLock bag an putting them in the freezer overnight to allow the metal to contract. This will facilltate the installation process. When installing Phenolic (THB) style bearings we recommend that the housing should be allowed to cool down slightly to avoid causing any damage to the Phenolic material. 6-If you're uncomfortable replacing engine bearings, please contact your local hobby shop or talk to a knowledgeable hobbyists or fellow club member. If you can not find anyone to assist or guide you, please give us a call and we will endeavor to recommend a service that can do the job for you. 7-Maintenance and care of your engine's bearings is of the utmost importance. Rust is the most common problem, however with intelligent care and the use of high quality additives such as our Midas Touch products, it can be kept in check. Remember to store your engine in an area which is as humidity free as possible. Always perform periodic inspections on all moving parts.