Early 50's QD/FD gears the same? (FR?)

[Scaaty]

From what I can tell the gearcase/gears are the same in a 10hp QD, and 18hp FD. 5 bolt case, and I think the years are 1955 to 57 the same? Different case in 58 I think. Anyone add a little more knowledge to this? Thanks

 

[F_R]

Re: Early 50's QD/FD gears the same? (FR?)

That is basically correct concerning the gearcases. But I'm not exactly 100% sure if the gears are the same without going to the parts books. Might make a difference from year to year also. Just not really sure about this.

 

[R.Johnson]

Re: Early 50's QD/FD gears the same? (FR?)

The 10 HP has a thicker driveshaft, ahd the pinion is keyed to the shaft. The pinion does not ride up into the lower gearcase bushing. The 18HP has a thinner driveshaft, and the drivehaft is splined to hold the pinion. The pinion ride's up into the lower geaecase bushing.

 

[F_R]

Re: Early 50's QD/FD gears the same? (FR?)

OK, here we go again. I think we beat this subject to death once before. I believe R.Johnson is referring to the 4 bolt gearcase. Earlier models shared gearcases, FD/QD.

Here is the book, concerning the gears inside. You'all figure it out for yourselves, my brain is too feeble. Except I do see cases where they are shared FD/QD

 

[Chinewalker]

Re: Early 50's QD/FD gears the same? (FR?)

As a set, the gears will interchange between most of the 5-bolt gearcases of the 1950s. Also, you can use a set of gears from an EARLY 4-bolt 10/12/14/15 hp gearcase (1954 and prior). Problems arise when you try to mix-and match gears themselves. I have counted at least five different gear configurations as they altered spiral patterns, tooth counts, etc. over the years to achieve better durability and reduce gear noise.

- Scott

 

[R.Johnson]

Re: Early 50's QD/FD gears the same? (FR?)

The QD's were made from 1949 to 1963, they were all 10HP. with a four bolt case. The FD's were made from 1956, to 1968. They were 15,18, 20 HP with a five bolt case. The QD's, and FD's would not share part's to my knowledge., and they certainly never shared gearcase's. What part's do you need?

 

[Chinewalker]

Re: Early 50's QD/FD gears the same? (FR?)

Just to clarify...

The QDs and FDs DID share gearcases up until 1958, when the QDs got the beefed up version of the 5.5/7.5 unit. A 1956 Johnson FD-10 15hp is the same as a 1956 QD-17 10hp from the bellypan on down. They both have 5-bolt units. A 1954 Evinrude 15hp Fastwin has a nearly identical lower unit to that used on the 1954 Johnson QD-15. (Evinrude did not make a 10, and Johnson did not make a 15 in '54.) They both have 4-bolt lower units that were similar to the 1955 and later 5-bolt lower unit. This earlier 4-bolt unit was completely different from that used on the 1958 and later 10hp models.

- Scott

 

[F_R]

Re: Early 50's QD/FD gears the same? (FR?)

Chinewalker got it correct.

 

[F_R]

Re: Early 50's QD/FD gears the same? (FR?)

lest there be any further disagreement.

 

[Scaaty]

Re: Early 50's QD/FD gears the same? (FR?)

Good info all. I was pretty sure the cases were the same 1955 to 57. Looks like the chart has FD 11 and QD 17 gear sets the same. I have a complete set of good gears from a 57 FD 11 18hp, and a QD 17 56 case coming apart. The bottom fin part look the same. I guess my best bet is to get the Mic out and do some checking and counting.Thanks for the info, much appreciate the time put into the replies!...