Old ops engine

[Vince Fantauzzi]

Does anyone know where I can find a collett/shaft adapter for this engine? lm

 

[JoachimRuess]

Hello Vince,
try aeromarine:
the thread in the crankshaft is M6 (metric)!
You will need a screw M6 too.

 

[Vince Fantauzzi]

Does anyone know where I can find a collett/shaft adapter for this engine? View attachment 274710 View attachment 274710 View attachment 274710 lm

Hello Vince,
try aeromarine:
the thread in the crankshaft is M6 (metric)!
You will need a screw M6 too.

Thanks, Joachim... Looks like they have them. And I guess I'll have to provide the screw to fasten it to the crankshaft. Appreciate the help.

 

[brad nichols]

My OPS 67 is 1/4 X 28 standard thread and is a stud. Cable nuts from Al Hobbs, Octura and lots of others

Brad

 

[Vince Fantauzzi]

Hey, Brad the thread opening on this engine crankshaft measures 5mm...tried a 1/4 28 way to big...looks like maybe I need a 5mm screw?

 

[ALLAN YUEN]

Look broke thread need to replace new whole crankshaft

 

[Terry Keeley]

It used a 1/4-28 threaded stud IIRC...

 

[JoachimRuess]

Vince,
i am sure its M6 metric

 

[Brad Christy]

Vince,

The minor diameter of an M6x1.0 threaded hole is 5mm. While I have no direct experience with that engine, I'd say Joachim is correct.

Thanks. Brad.
Titan Racing Components
BlackJack Hydros
Model Machine and Precision LLC

 

[brad nichols]

Gey a bolt and try it but don't force it

Brad

 

[Joe Wiebelhaus]

It used a 1/4-28 threaded stud IIRC...

YUP, every one of them.......................

 

[Vince Fantauzzi]

Well, looks like Joachim was right, it is 6mm. So I went to the local nuts n bolts shop and got a 6mm stud and it threaded in like a honey. Now I gotta get my hands a 1/4 shaft collett with 6mm threads. Anyway, thank you all for the help and suggestions.
Happy boating!
Vince

 

[Terry Keeley]

Funny, I always thought they were 1/4-28 as that's what collets we used, same as a NR21.

Speedmaster does list them as 6mm tho: http://www.rossisales.com/Collet_Info.pdf

 

[Rudy Formanek]

Vince, I have 3/16 and 1/4 collects came out of my old, old OPS67 stuff $20.00 ea plus $5.00 shipping, buy both and get a free drum valve intake free, $45.00 ps they are 6mm x1.0mm I am on way out the door, have race this weekend, but will be home evenings.