Low compression on three cylinders

40

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

109,985

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

Your Answer

Add photo

Related Questions

  • Why my 61 ranchero turns on without ignition swicht 1 answer

    I have a 61 ford ranchero and im trying to figure out why it turns on with out any ignition swicht, i have to unplug the battery terminal, i changed the starter relay 2 times and remove the igniti...

    1961 Ford Ranchero

    -

    Maintenance & Repair

  • Why is my car over heating? 4 answers

    I have a 1960 Ford Ranchero. It had a straight 6 cylinder. I took it off and put a 289, i put a rack and pinion on it, i put power steering, and i put ac in it. When i did all this i ran out of room...

    1960 Ford Ranchero

    -

    Maintenance & Repair

  • Old ford drum brakes 2 answers

    I have a 1977 Ford ranchero. All of a sudden one morning after warming up engine it felt like the brakes were dragging really bad. So I lifed one rear wheel at a time and removed tire and took the...

    1977 Ford Ranchero

    -

    Maintenance & Repair

  • Hi i have a 1979 with a 351m in it can you please tell me what that means? Is it a 351c with 400 heads? 11 answers

    It runs like a clock. It has 101000 mi. What issues are norm with this motor? What can i do to it? To wake it up?

    1979 Ford Ranchero

    -

    General

  • Is it possible to get a factory build report on a 79 Ford Ranchero? 1 answer

    According to the VIN # my truck came with a 302. The engine that I have is a 5.0 liter HO. The firing order for the cylinders is the same as a 351. Is it possible to check to see if the current eng...

    1979 Ford Ranchero

    -

    General

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
2,198 Great Deals out of 206,316 listings starting at $1,499
Used Ford Mustang
474 Great Deals out of 45,735 listings starting at $1,999
Used Ford Bronco
196 listings
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Ford Torino
26 listings
Used Ford F-100
152 listings
Used Ford F-250
481 listings starting at $3,475

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.