vacuum leak
#1
vacuum leak
i just finished putting the engine together after the rebuilt and had low vacuum (12-13)and a tapping?noise on the passenger side cylinder head.cylinder heads are rebuilt by pops and cam/lifters are new compcams.i took the intake manifold out hoping i didn't seal it properly and put it back in again but nothing changed.so yesterday i took the cylinder heads out and found cylinder 1,2 and 6 were really black ,the rest were ok.the whole ignition system is new.so i think is something in the heads/lifters.the valves feel tight in the guides ,but i found some chips missing in some of the valve guide bases,i dont know if that can cause a leak? what do you guys think.thanks and happy new year!
here are the pictures:
ford fe cylinder heads - a set on Flickr
here are the pictures:
ford fe cylinder heads - a set on Flickr
#2
#4
update :i found a lifter with 2 small cracks on the smooth part of the body,would that make the lifter not hold pressure thus causing low vacuum ?
picture of leaky lifter:
PC290098 | Flickr - Photo Sharing!
picture of leaky lifter:
PC290098 | Flickr - Photo Sharing!
#5
I've never seen a lifter fail like that. But if the crack goes through to the inside of the chamber I could see where that would cause the lifter to collapse. That would account for the "ticking" sound.
How radical is the camshaft? The more radical, the lower the idle vacuum will be. Also, off a tooth on the timing will change the vacuum characteristics of an engine.
Did you run a compression test before you pulled the heads?
You need as much info as possible to accurately diagnose the problem.
How radical is the camshaft? The more radical, the lower the idle vacuum will be. Also, off a tooth on the timing will change the vacuum characteristics of an engine.
Did you run a compression test before you pulled the heads?
You need as much info as possible to accurately diagnose the problem.
#6
#7
Trending Topics
#8
Thread
Thread Starter
Forum
Replies
Last Post
SEB72
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
3
02-21-2014 06:21 PM
plowboy12
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
2
02-15-2014 02:00 AM
minnesota-clint
Ford Inline Six, 200, 250, 4.9L / 300
6
07-05-2013 04:01 AM
LTTLMAN
Fuel Injection, Carburetion & Fuel System
2
02-12-2005 04:00 PM
thunderguns71
Fuel Injection, Carburetion & Fuel System
1
05-19-2004 07:11 AM