The limit for the 3-4 cylinder Chrysler/Force is 0.04 in OD.
Pistons are available in 0,01, 0,02, 0,03 and 0,04 in OD.
If I do not remember wrong OEM pistons are not available in all those four OD sizes.
Aftermarket have all four, I believe.
From the pic this is a Chrysler from 1974 and up.
From 1974 they were rated 75Hp until 1978-79 I believe.
If it has the belt driven distributor the keyswitch should be as follows.
Red B terminal
Yellow S terminal
Blue I terminal
Green C terminal
The two M terminals are not...
Okey now I understand why there was threads in the pic at post #17.
I have newer seen this two piece shift rod. Maybe some other has, jerryjerry or pnwboat etc.
My bad LU with the bellow seal has the regular one piece lower shift rod.
This regular shift rod is screwed into the shift arm, but...
Force which basically is a Chrysler is in my opinion a good old school engineered OB.
Easy to work on compared to other brands from the same period.
US Marine bought Chrysler OB in 1984-85 and put the Force name at the hood. Later Brunswick (Mercury) bought Bayliner which was the Force brand...
Okey Radiodan, then Franz still have the same offer as when I email him last autumn.
Maybe I will send my cover too, but as I had a spare LU with another typ of seal I decided to use that.
200 dollars is a lot of money but maybe worth it.
Thanks for the information and good luck.
Radiodan, the bellow is the seal believe me.It is a N/A part.
I have the same issue with one of my spare lower unit.
Check with Franz Marine what he can offer.
I email with he last autumn and the solution was a new typ cover with a regular rubber seal, no bellow.
If do not remembered wrong it...
Notice that the rubber bellow at the shift rod is the seal to the gear lube and it is out of order. First pic.
It will leak a lot and yes the shift rod has to be threaded back into the shift arm.
Maybe you can pull the whole cover and get it back to the shift arm but still the bellow is the...
Two inch above the cavitation plate is not enough.
The level should be above the impeller housing and is located at the split line of the LU to the leg.
It is at least 4 inch as jerryjerry says.
The rubber seal that should be at the top of the drive shaft is not a big issue.
Just put a light coat of marine grease at the spline and it will be enough.
That rubber seal is for protect the drive shaft spline and crank to rust and get stuck.
Your big issue is the rubber below for the shift...
Topgun sometimes it is hard to find out why one cylinder went out.
But as you say lean mixture is a good spot.
Clean the carbs and set the air fuel mixture screw at about 1 1/4 turn out.
Set the timing at 30 dgr at WOT.
Use good TCW-3 two stroke oil and do not run the hell out of the engine...
Nice work, looks great.
Is the decals from the factory brochure 1979 model?
I think I have seen the tiger in that year, but can be wrong.
Looks really nice.
Las, I have not checked for any resistance on the shift shaft yet. Will try tonight.
The different in throw from reverse to forward depending on how far the shift rod is out from bottom can be a measurement error from my side.
I noticed that when the dogs at gear and clutch dog are align perfect...
Las I pulled the spare LU apart tonight and I will update the measurement.
The height of the dogs in both gears and the clutch are 4 mm (0,16 in).
The fully throw from reverse and forward is 12,4 mm (0,49 in) with the shift rod turn all way down in the shift arm and 12,7 mm (0.50 in) with the...
I have not order a new thrust washer "spacer" yet, if it is that what you mean.
I have to disassemble and measure the one that is in it now.
I have about 1 mm end play now and the service manual calls for about 0,20 mm.
Las I will check it soon, I am in order to disassemble the spare LU cause of the incorrect prop shaft end play.
Maybe in this weekend.
Then I have to correct myself about the height of the dog in the gear.
It is 4 mm (0,16 in) not 2 mm (0,08 in) as I said before. Sorry!
The throw at the shift...
The pic of the id plate has a flash so it is hard to se if there are four or five digits in the model number.
It should be five digits, I think.
However, from the pics of the hood and the design, color etc it is a 1967 or 1968 year model.
Franz Marine should be your source for seals and other...
Las your measure of the total throw from reverse to forward and vice versa seams pretty right.
I have measure my spare LU and have roughly 12 mm measuring with a folding rule.
From my experience when I changed LU on my sons 65Hp the throw from when the clutch dog starts to engage the gear and...
