Dub Jett Engines Support Bob Brassel of Dub Jett Engines provides direct support here for Jett Engines.

Hole in crankshaft snout.

Reply

Old 08-06-2008, 08:59 PM
  #1  
Kmot
Thread Starter
My Feedback: (24)
 
Kmot's Avatar
 
Join Date: Jun 2003
Location: Northridge, CA
Posts: 10,939
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Hole in crankshaft snout.

Bob, the 120 I am overhauling has a hole in the snout, where the prop stud goes. Well, not a hole but it is cracked and broken, looks like when it was drilled it only had a few thou thickness left and it has broken through. I know you are supposed to leave the stud loose, so that means a leak.

What do you recommend I fill the area with? JB Weld?
Kmot is offline  
Reply With Quote
Old 08-07-2008, 08:33 AM
  #2  
bob27s
My Feedback: (19)
 
bob27s's Avatar
 
Join Date: Apr 2002
Location: Cleveland, OH
Posts: 5,576
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hole in crankshaft snout.

Is the end of the actual crankshaft chipped or cracked? (outside of the threaded portion?).

If it is a small crack or hole, dont worry much about it. But make sure the drive collar fits over it properly and that the prop drive seats properly.

The threaded section of crankshaft does not pass through no way it can leak to the crankcase even if the stud is completely removed. So no threat in that respect.

Bob
bob27s is offline  
Reply With Quote
Old 08-07-2008, 10:02 AM
  #3  
Kmot
Thread Starter
My Feedback: (24)
 
Kmot's Avatar
 
Join Date: Jun 2003
Location: Northridge, CA
Posts: 10,939
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hole in crankshaft snout.


ORIGINAL: bob27s


The threaded section of crankshaft does not pass through no way it can leak to the crankcase even if the stud is completely removed.

Bob
Well, that is indeed the problem. The hole, when drilled, left only a few thousandths of a 'wall' and it has cracked and broken through. The photos are taken with a small LED inspection light shining through the opening.

So what do you suggest? JB Weld? Will JB Weld hold up under heat and pressure?
Attached Thumbnails Click image for larger version

Name:	Ge95976.jpg
Views:	28
Size:	41.1 KB
ID:	1006055   Click image for larger version

Name:	Kf13940.jpg
Views:	19
Size:	26.7 KB
ID:	1006056   Click image for larger version

Name:	Lq38872.jpg
Views:	33
Size:	46.9 KB
ID:	1006057   Click image for larger version

Name:	Dw65143.jpg
Views:	20
Size:	102.6 KB
ID:	1006058  
Kmot is offline  
Reply With Quote
Old 08-07-2008, 11:21 AM
  #4  
bob27s
My Feedback: (19)
 
bob27s's Avatar
 
Join Date: Apr 2002
Location: Cleveland, OH
Posts: 5,576
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hole in crankshaft snout.

OHHHHHHHHHHHHHHHh.............................

Yeah, thats lookin weird.

This is for the big-block 120 .... (old type cast case) correct?

Hold of on the JB for a moment... let me check with Dub

Bob
bob27s is offline  
Reply With Quote
Old 08-07-2008, 02:56 PM
  #5  
bob27s
My Feedback: (19)
 
bob27s's Avatar
 
Join Date: Apr 2002
Location: Cleveland, OH
Posts: 5,576
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hole in crankshaft snout.

Ok

a bit of JB installed from the prop stud side will work ok.

I checked with Dub ..... it comes from trying to make the thing a light-as-possible.

He offered to fix it if you want .. but likely you can handle this ok.
bob27s is offline  
Reply With Quote
Old 08-07-2008, 07:11 PM
  #6  
Kmot
Thread Starter
My Feedback: (24)
 
Kmot's Avatar
 
Join Date: Jun 2003
Location: Northridge, CA
Posts: 10,939
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hole in crankshaft snout.

Thanks Bob. JB it is!
Kmot is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service