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Permatrim Installation Instructions
Note: “AV Plate” denotes engine Anti-Ventilation plate which may also be referred to as the "cavitation plate."
TOOLS NEEDED:
Electric drill with ¼” drill bit
Masking tape
Phillips-head screwdriver
7/16” wrench
Small amount of 101, 4200 or 5200 marine sealant. (Must be rated for underwater use. Silicone is not recommended.)
Tools to remove your propeller
Small rags for cleanup and to cover prop hub
(If needed) Sealant Cleaner\Remover that is safe for painted surfaces
In these pictures I am installing a model 001 Permatrim on a 2004 F75 Yamaha outboard. All of the top mounted AV plate Permatrims are mounted in this fashion. The smaller outboards use 4 bolts per side, while engines over 115hp uses 5 bolts per side. All Permatrims are made to fit specific outboards. You should not normally have to alter a Permatrim to make it fit. If something about the fitting of the Permatrim does not seem correct, please do not hesitate to call and ask.
STEP 1:
Remove propeller and cover prop hub area on gear case with a rag to protect the shavings from entering this area. Also with the propeller removed this gives you more area for your electric drill.
STEP 2:
Drill the first two holes, one on either side, ¼” holes aft of the sacrificial anode. It is hard to take a definite measurement anywhere on a gear case, so I do my best and eye it up. Make sure all of the holes drilled are well in from the edge of the ventilation plate. Usually ¾” is a good reference.
STEP 3:
Lay Permatrim over the top of the AV plate. It is difficult to take an exact measurement for placement because of the gear case and Permatrim shapes, so I check to make sure the Permatrim is straight by literally eyeing-up the Permatrim on top of the AV plate. The Permatrim should be mounted as far forward on the AV Plate without the Permatrim riding up on the curved portion of the AV Plate.
Once you determine a suitable location for the Permatrim, hold the Permatrim in place by either using a clamp or a partner and drill through the two previous holes you made in the AV plate to mark the Permatrim with the drill bit. Do not attempt to drill all the way through - just mark the plate. Remove the Permatrim and drill the 1/4” holes through where marked. Install the Permatrim temporarily using two bolts - do not tighten them all the way, make them just snug enough to hold the Permatrim in place for the drilling of the remaining mounting holes.
STEP 4:
This step is for measuring where the remaining bolt holes will be drilled. With the Permatrim installed using the temporary bolts, take a piece of masking tape and lay it down starting from the center of your first bolt hole (where the temporary bolts are now) towards the forward end of the Permatrim. Make sure to look under the Permatrim and check that the tape line is at least ¾” inboard from the edge of the AV plate. On most outboards the tape lines will not be parallel and will angle slightly away from each other following the shape of the AV plate. Using a tape measure, mark the remaining bolt holes (5 total on 115hp and above, 4 on all others).
The very most forward bolt hole should be 1” to 1-1/2” from the most forward part of the Permatrim, again making sure that you will be catching enough of the AV plate. AV plates will be shaped differently so you will need to use your best judgment on where the forward bolt hole should be. The tape may be placed on the underside of the AV Plate and the plate can be drilled from the bottom to make it easier if needed.
STEP 5:
After marking the bolt holes drill through the Permatrim and AV plate together. Depending on the electric drill type used, there will be sufficient room for the drill on the most aft holes. As you go forward, the clearance from the drill to the side of the engine will become close. Beware of the drill chuck spinning into the side of the engine. On some engines this may be too close that sometimes it is best to use the next size drill bit and drill the forward holes on a slight angle. The slightly bigger holes will allow the bolts to sit flat even though they are at an angle.
After drilling is complete, remove the two temporary boltsremove the Permatrim. Clean the metal shavings between the Permatrim and the AV plate. Dab a bit of the marine sealant around each of the bolt holes on top of the AV plate.
STEP 6:
Lay the Permatrim on top of the AV plate. Install all bolts from the bottom up through the AV plate. Place one flat washer on top of the Permatrim over the bolt and then place the nylock nuts. Tighten all bolts until slightly snug until all the bolts are installed. Once all bolts are installed, tighten the middle bolts first then work aft, followed by the most forward bolt last. Make sure the Permatrim is laying flat on the AV plate before final tightening takes place.
With this grade of SS bolts in this size, the torque spec is approximately 10ft lbs. Or…..just tight, but not too tight since these ¼” bolts can be snapped if tightened too much.
FINISHED INSTALLATION PICTURES
Please feel free to contact us with any installation or use questions you have about your new Permatrim. With proper installation and care, the Permatrim will last the life of your outboard.
Permatrim Hydro-Foils USA
Andrew J. Munao, Jr.
Toll Free: 800-213-3323
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