QD 21 Head bolts?

[jimk]

Does anyone know where I can find head bolts for this motor? 10 hp Johnson QD 21. One I am working on getting 1 out as it broke off but the other 9 are in pretty bad shape. Would I be able to use  hardware store bolts?  I am ordering a new old stock head gasket and should I use a sealer such as permatex aviation cement on it? Thanks for any info!

• This topic was modified 2 years, 11 months ago by jimk.

[frankr]

You can use hardware bolts IF, IF, they are the same length AND the threaded portion is at least as long as the originals.  OMC was great about making some non-standard bolts.  In other words, take an old one to the store with you.

Part number was 302099, might be NLA.

Personally, I’d avoid the non-graded cheapo (weak) bolts.  Also, I wouldn’t suggest Stainless Steel.  They might sound like a good deal, but they actually will corrode in the hole worse than the steel ones, and are harder to drill out if you should break one in the future.

• This reply was modified 2 years, 11 months ago by frankr.

[Bob Wight]

I used Grade 5 bolts from the hardware store on my QD-19 and QD-20.  Yours should be the same – 1/4-20 bolts x 1-3/4″ length.  As Frank noted, I wouldn’t use stainless steel bolts.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[jimk]

Sounds good! Any ideas on the use of gasket sealer?

[frankr]

Good question on the sealer.  OMC put them on dry, then later said use cement.  Now, some new gaskets say don’t use cement.

[fleetwin]

Use the gasket sealer.

[jimk]

I am waiting on the gasket but been checking things over on it and keep finding problems. I expected all new ignition but found the pistons hammered by what I am guessing the wrong plugs.  the head had a couple chunks broke off it but I did have one from a 10 hp Evinrude so that will work.  The head had been pried off by the previous owner and there was a couple gouges on the cylinder that I will try and repair with jb weld. Might end up being a parts motor! The pistons make me a bit nervous but will go ahead and put the head gasket on and see how the compression is. The cylinders look good as in no scoring so thats a plus.  Needs the lower resealed to so lots to do if I try and save it.  Thanks so far!

[fleetwin]

Not sure what year a QD21 is? But, if it is older than 1961, it may have worn wrist pin bushings/rods allowing the pistons to travel higher and hit the plugs/close up the gaps. Check for writ pin slop.

[Bob Wight]

fleetwin wrote:

Not sure what year a QD21 is? But, if it is older than 1961, it may have worn wrist pin bushings/rods allowing the pistons to travel higher and hit the plugs/close up the gaps. Check for writ pin slop.

Good suggestion on the wrist pin / bushing wear – the QD21 is a 1960 model.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[jimk]

I received the head gasket and put it back together and only 50# in top and 70 in the bottom cylinder.  Its now a parts motor.  It would have needed new seals in the lower and had all the original ignition so just not worth fixing but thanks for all the help on it.

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