Perkins 4107 (known also as the Westerbeke 40) engines have been out of production now for roughly two decades. New 4107 cylinder heads and short blocks are no longer available from the factory. Perkins doesn't even offer 4107 engine overhaul parts kits.

But Foley Engines - the oldest engine distributor in North America - can help 4107 owners! We can get you back up and running quickly and inexpensively. For those of you who want to rebuild your present engine we have Foley Engine Parts Kits. These kits contain the correct 4107 internal parts including wet sleeves and "O" rings. (Unforunately, the less expensive 4108 internal parts can't be used to rebuild a 4107.)

For those that want the upgrade to the more modern, powerful, 50 HP 4108 we offer brand new 4108 short blocks. These 4108's are less expensive to maintain than the 36HP wet-sleeved 4107 and have a one year factory warranty. For those who wish to re-use their old 4107 cylinder head in conjunction with a new 4108 short block we strongly encourage that you carefully inspect, magnaflux and pressure-test your head. These heads are prone to cracking and should be checked by a competent shop before rebuilding. (We can provide you with the names of severral reputable diesel shops in your area that participate in the Automotive Engine Rebuilders Association.)

ADDITIONALLY - some very early 4107's had stud holes 1/16 of an inch smaller than on the early 107's and 4108's. To re-use a small hole 4107 head on a 4108 short block simply ensure that the stud holes on the head are 7/16 (if not, drill them out on a drill press) and use the 4108 studs with their higher clamping force. Our Foley Tech Tip #5 gives the head torque values and valve settings for these heads.

For those who prefer to stay with the small hole 4107 head we offer several alternatives. If your 4107 head is cracked you can replace it with an oven-baked, shot blasted, magnafluxed head casting and a Foley Valve Train Kit (all valves, valve springs and guides). For those whose 4107 head is uncracked we offer remanufactured exchange cylinder heads.

FINALLY - For those who want to upgrade we stock brand new 4108 cylinder heads which eliminates any concern about stud size.

The final consideration of one contemplating rebuilding or upgrading a 4107 Perkins is the camshaft. After 20 years of marine use, your shaft is undoubtedly worn. Unfortunately, camshafts are not supplied with new short blocks, and it is an issue that can't be avoided. But again Foley can help. We stock reground Perkins 4107/8 camshafts. The reground shafts are done on a Storm Vulcan cam grinder and after grinding are Parkerized. They meet or exceed factory spec's for new cams with significant savings.

Please call us direct with any questions. As the oldest Perkins specialist in North America (we were founded in 1916), we have the experience to help you maintain your Perkins 4107 and upgrade it to the latest spec's.

In all cases, the final decision to follow the analysts' recommendation is yours. We here at Foley Engines specialize in Perkins, Continental, and Ford engines, Hurth and Borg-Warner marine gears. Our company has been servicing these engines since 1916 and our analyses are sensitive to their unique conditions and characteristics. An oil analysis program is a tool. As you act on the results, the program can assist you in scheduling and reaching your maintenance goals.