compression test with intake off?
Thread Starter
|
New User
Joined: Aug 2015
Posts: 8
Likes: 0
compression test with intake off?
I'm getting ready to test the compression on my 1999 f150 5.4 350k miles. It ran like crap when I bought it with no power at all. I did a bunch of preliminary testing, COP testing, voltage tests, sensor checking, took off the intake manifold to reseal it for possible leaks, checked all the vacuum lines, etc.
So now the engine has no intake manifold on or valve covers. I noticed that the passenger side timing chain is really loose so that will create some of my problems if it jumped time. My question is can I still run the compression test this way? No intake and probably out of time.
So now the engine has no intake manifold on or valve covers. I noticed that the passenger side timing chain is really loose so that will create some of my problems if it jumped time. My question is can I still run the compression test this way? No intake and probably out of time.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Compression test ok because you normally open the throttle to do that test.
The chain tensioners are hydraulic operated from system oil pressure.
During compression testing they would not have any tension from that source by just cranking the motor on battery..
All you want is to fill the cylinders with enough air to measure the cylinder static compression pressure the same on way all cylinders.
Good luck..
The chain tensioners are hydraulic operated from system oil pressure.
During compression testing they would not have any tension from that source by just cranking the motor on battery..
All you want is to fill the cylinders with enough air to measure the cylinder static compression pressure the same on way all cylinders.
Good luck..
Thread
Thread Starter
Forum
Replies
Last Post
406angler
1967 - 1972 F-100 & Larger F-Series Trucks
0
Jul 23, 2017 04:21 PM
krazyness
1973 - 1979 F-100 & Larger F-Series Trucks
5
Feb 25, 2016 09:09 PM
rheal
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
1
Apr 15, 2012 06:03 AM
TheNomad
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
11
Jun 18, 2008 08:35 PM
