FOR PERKINS 4.107 and 4.108

SERPENTINE PULLEY KIT - WHAT'S INCLUDED

• A. Crankshaft Serpentine Pulley p/n T336-108C

• B. New Fresh Water Pump with Serpentine Pulley already fitted p/n T0054/336- 108W

• C. Serpentine Pulley for alternator. (17mm bore) Fits the Balmar 60, 70 and 90 series and most common Delco Alternators and others. p/n T3781

• D. 6 Groove Serpentine Belt p/n T060400 for 4.108
  Only for Westerbeke 40. 1 x 6 Groove Serpentine Belt p/n T060415

• E. 1 3/8” x 3 1/2” hose to extend fresh water cross pipe to clear the wider belt (only needed if Bowman Manifold is fitted.) as pictured above. p/n T1.3750

Figure 1 – Kit Assembly

• F. Front crankshaft oil seal in case the original seal is damaged during pulley removal. p/n 0730098

• G. Only for Westerbeke 40 Bolt and spacer kit. for Balmar with 2” mounting foot: 1 x crankshaft bolt 32162316, 1 x crankshaft washer 33124119

WHEN PLACING YOUR ORDER...

• We recommend ordering an additional spare belt. Let us know which alternator you have to ensure we supply you with the correct size pulley, as these will vary between manufacturers. We cover the most commonly used sizes per item “C” above.

• Your kit will include a new water pump with the serpentine pulley already installed.

• For future reference, if you have a 4.107 or a Westerbeke 40, the part # for a replacement water pump using our serpentine pulley system will now be U5MW0054

• This is a standard 4.108 pump which is fully interchangeable but has a larger diameter shaft.

• The part # for replacing a 4.108 pump is unchanged.

• For our records and future guidance, let us know if you have a 4.107 a 4.108 or a Westerbeke 40.

SERPENTINE PULLEY KIT INSTALLATION INSTRUCTIONS

     Westerbeke 40 Only.  Owners can purchase from us the necessary replacement larger phosphate bolt (part# 32162316) and washer (part# 33124119) to fit in place of the original one. Tighten with 1½" socket to 230 ft lbs.

The Westerbeke 40 requires some additional bolts and spacers to re-align alternator to be placed as shown above.

Westerbeke 40 with Balmar 2” foot mount

     2. Water Pump with Pulley - Drain anti freeze coolant. Remove the old fresh water circulating pump. Clean the gasket surfaces, and fit the new water pump which will have the serpentine pulley already installed. (new gasket supplied). 4.108 Owners with the Bowman manifold. (as configured in the above picture) will be required to fit the short supplied hose to bring the fresh water cross over pipe forward slightly to avoid contact with the new serpentine belt. This will replace the existing hose. This does not apply to others not using the Bowman manifold.

     3. Alternator Pulley - Replace the V pulley on the alternator with the serpentine pulley. An impact wrench works well for this. Some alternators have a provision in the end of the armature shaft for an allen wrench to hold armature from turning while tightening with an open wrench. Torque may vary according to your alternator manufacturer.

4. Serpentine Belt & Tension - Fit the new serpentine belt. Tension should be adjusted using the original alternator adjusting arm so that, with normal thumb pressure, the belt can be depressed 3/8 of an inch at the center of the longest span. (per fig 2) NOTE. The new belt will require re tightening after a few hours of operation. This check should be done while the engine and belt is warm. Continue to check tension until the new belt no longer stretches. Following this procedure, periodic checks should be made checking condition and tension. Carry a spare!

     5. Replacing Coolant - If you have not changed your coolant within the recommended period, this is a good time to do so. We suggest a good quality extended life ethylene glycol anti freeze with corrosion protection and rust inhibitor. Once coolant is filled with a 50% 50% mix, approx. 6.6 qts., not including hot water heater, check for leaks. Be sure to vent the air, and monitor the fluid level and temperature carefully before and after engine comes up to working temperature. Caution: Do not remove cap to check level until engine has cooled down as the system will be under pressure and could cause burns.

     For your convenience we have provided an Adobe Reader file at the bottom of the page with the same instructions on how to install your Serpentine Pulley Kit.  If you don't have Adobe Reader installed on your computer you can download the program for free by clicking on the "Get Adobe Reader" button below.