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

113,215

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
2,228 Great Deals out of 182,698 listings starting at $1,500
Used Ford Mustang
755 Great Deals out of 42,814 listings starting at $1,300
Used Chevrolet Corvette
248 Great Deals out of 22,275 listings starting at $2,500
Used Ford Bronco
176 listings
Used Chevrolet Camaro
422 Great Deals out of 31,920 listings starting at $2,395

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.