Compression test on the stand

Reply Subscribe

Thread Tools

Search this Thread

Feb 26, 2012 | 06:56 PM

#16

PaysonPSD

Post Fiend

Joined: Nov 2007

Posts: 9,549

Likes: 14

From: Payson, AZ

Quote:

Originally Posted by Bob Taulbee

Robin, I think you may do more harm than you think, I believe the impact wrench will over torque the crank bolt and damage the threads or berak the bolt.

The spec for the damper bolt is 212 lb/ft of torque. The engine starts turning long before you can get it that tight. Don't think that bolt would get damaged unless you tried this on a seized engine.

Feb 26, 2012 | 07:28 PM

#17

snakedoc

Postmaster

Joined: Jan 2009

Posts: 4,006

Likes: 1

From: AL, Reform

i have a motor on a stand right now, when i get it rebuild this week i will try the breaker bar and see what it dose. then again in the truck with the starter to compare.

Feb 26, 2012 | 08:25 PM

#18

PaysonPSD

Post Fiend

Joined: Nov 2007

Posts: 9,549

Likes: 14

From: Payson, AZ

Quote:

Originally Posted by snakedoc

i have a motor on a stand right now, when i get it rebuild this week i will try the breaker bar and see what it dose. then again in the truck with the starter to compare.

Matt,

While it's on the stand can you throw in a try wth a 1/2" impact wrench?

Feb 26, 2012 | 08:31 PM

#19

snakedoc

Postmaster

Joined: Jan 2009

Posts: 4,006

Likes: 1

From: AL, Reform

i dont have an impact.
dont like them.
i know a guy that lost an eye to one when the socket busted.
and the ones i have used broke more bolts then they got out.

Feb 26, 2012 | 11:29 PM

#20

73ferdf250highboy

Elder User

Joined: Feb 2011

Posts: 518

Likes: 0

From: west sacramento ca

you could always just seal the one hole at a time

Feb 27, 2012 | 07:23 AM

#21

Snowseeker

Hotshot

Joined: May 2005

Posts: 13,484

Likes: 42

From: Stevens Point, WI

Compression tests are supposed to be done with all the spark plugs/glow plugs removed. But that one cylinder you are testing is gonna make the motor hard to turn over by hand and get a accurate reading.

Feb 27, 2012 | 02:52 PM

#22

PaysonPSD

Post Fiend

Joined: Nov 2007

Posts: 9,549

Likes: 14

From: Payson, AZ

Quote:

Originally Posted by snakedoc

i dont have an impact.
dont like them.
i know a guy that lost an eye to one when the socket busted.
and the ones i have used broke more bolts then they got out.

Thanks anyway Matt.

As for broken bolt in this situation see post 16.

Mar 15, 2012 | 06:45 PM

#23

snakedoc

Postmaster

Joined: Jan 2009

Posts: 4,006

Likes: 1

From: AL, Reform

update
i did a compression test today on the motor on the stand with a breaker bar.
i turned it with all 210lbs i had all i could get was 30psi. i just cant turn it fast enough to not get leak down.
so a test on the stand with a breaker bar wont tell you much.