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

114,295

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

Your Answer

Ford Ranchero Experts

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

Related Models For Sale

Used Ford F-150
2,283 Great Deals out of 183,736 listings starting at $699
Used Ford Mustang
674 Great Deals out of 37,812 listings starting at $895
Used Chevrolet Corvette
286 Great Deals out of 20,556 listings starting at $2,990
Used Ford F-100
161 listings
Used Ford Torino
37 listings
Used Chevrolet Camaro
401 Great Deals out of 30,669 listings starting at $3,550
Used Dodge Charger
396 Great Deals out of 27,754 listings starting at $1,979
Used Ford Bronco
191 listings
Used Chevrolet Nova
154 listings
Used Pontiac Firebird
11 Great Deals out of 780 listings starting at $4,300
Used Ford Fairlane
79 listings

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.