Low compression on three cylinders

60

Asked by Jun 21, 2014 at 03:54 PM about the 1975 Ford Ranchero

Question type: Maintenance & Repair

I just purchased this car and got it running.  It runs rough, misses and doesn't idle
properly. A compression check showed no 5 cylinder was only 30psi.  I added oil to
determine if it was valves or rings, I think I added too much oil.  I pulled the engine and
was pleasantly surprised to find the engine is in great shape, recently overhauled.  I
pulled the piston on no 5 and found the rings and cylinder in great shape.  I pulled the
exhaust valve and found it was NOT seating.  Since it has hydraulic lifters I didn't try to
adjust them.  Two other exhaust valve appear to not be seating.  I have lapped them in
and reassembled the head.  Now I am wondering if the valves are too long,  How does
on check that?  Any discussion would be appreciated.   Gary

1 Answer

112,075

Improper push rod adjustment will not allow them to close properly.

Your Answer

Add photo

Related Questions

Search Ford Ranchero Questions

Ford Ranchero Experts

#1 MrBlueOval
MrBlueOval
Reputation 190
#2 dandyoun
dandyoun
Reputation 150
#3 Michael Tutty
Michael Tutty
Reputation 120
View All

Related Models For Sale

Used Ford F-150
2,174 Great Deals out of 195,110 listings starting at $290
Used Ford Mustang
721 Great Deals out of 44,996 listings starting at $1,500
Used Chevrolet Camaro
350 Great Deals out of 31,370 listings starting at $2,500
Used Ford Falcon
31 listings
Used Ford Torino
37 listings
Used Ford Fairlane
85 listings
Used Ford Bronco
195 listings
Used Chevrolet Corvette
209 Great Deals out of 22,044 listings starting at $2,500
Used Ford F-100
162 listings
Used Dodge Charger
531 Great Deals out of 28,912 listings starting at $2,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.