Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

308 crankshaft - why grind the front off

Started by lakeside , Mar 22 2010 08:09 PM

Please log in to reply

6 replies to this topic

#1 lakeside

Lotsa Posts!

Members
2,703 posts

Name:Col
Location:melb
Car:LC SBC
Joined: 07-November 05

Posted 22 March 2010 - 08:09 PM

Why grind the front off the crankshaft and tap holes here and there along the crank and them fill them allen key grub screws.

Posted Image

Back to top

#2 Struggler

Forum Fixture

Members
2,426 posts

Name:Andrew or AJ
Location:Canberra A.C.T.
Car:UC Sedan
Joined: 08-November 05

Posted 22 March 2010 - 08:13 PM

Mini strokers usually get a lot of metal ground off there to balance them properly (more so if using a 253 crank).

Not too sure on the holes and plugs, maybe they are extra oil galleries ?
Pull the plugs out and see where they go !!

Back to top

#3 lakeside

Lotsa Posts!

Members
2,703 posts

Name:Col
Location:melb
Car:LC SBC
Joined: 07-November 05

Posted 22 March 2010 - 10:33 PM

It out of a blue 308 engine i have.

i can't pull the plugs out and see where they go. They have been been grind off plus i bet they used loctite.

Back to top

#4 S pack

Scrivet Counter

Members
15,722 posts

Name:Dave
Location:Luggage Point
Car:73 LJ
Joined: 25-January 10

Posted 23 March 2010 - 02:05 AM

Maybe heavy metal plugs for balancing???? The name of the stuff escapes me at the moment.

Back to top

#5 dattoman

Do I feel lucky? Well, do ya, punk?

Administrators
16,487 posts

Name:Neil
Location:Perth Western Australia
Car:LX SS , 76 Cadillac , 3 x dattos
Joined: 04-February 07

Posted 23 March 2010 - 02:23 AM

Mallory metal

Back to top

#6 _oldjohnno_

Guests

Posted 23 March 2010 - 05:28 AM

I'd say the grub screws are plugs for the oil drillings. Mallory metal slugs are generally much bigger - usually around an inch diameter - and pressed into the counterweights. I used to use it years ago to balance cranks and it was bloody expensive stuff then, no idea what it costs now. I still have some. Incidentally if anyone uses Mallory be aware that the dust off it (from machining or grinding for example) can cause permanent lung damage. I didn't know that at the time but only ever machined it with lots of water. Definitely don't grind it.