Ask Experts Questions for FREE Help !
Ask
    JEFFREFF's Avatar
    JEFFREFF Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 4, 2010, 06:12 AM
    Briggs 31p777 won't turn past compression, why?
    Engine turns over extremely hard, have to use heavy jumper cables on my truck and a battery jump box, both, to get enough juice to turn it past the compression point. I am on the 3rd starter... starts and runs fine if I can get enough power to turn it over. Any suggestions? It's a briggs model 31p777 type 0348 e1, code #040520za... 18.5 hp. Help!!
    DG's Avatar
    DG Posts: 1,375, Reputation: 109
    Ultra Member
    		  
    #2

    Mar 4, 2010, 07:49 AM

    I would check my valve clearance first,
    It should be 004-006
    Possible Camshaft problem.
    But check the simple stuff first
    MikeSE's Avatar
    MikeSE Posts: 1, Reputation: 1
    New Member
    		  
    #3

    Dec 21, 2010, 01:38 PM
    Check the oil (probably mixed with gas) level, needle valve bad causing gas to enter crankcase.
    You will need a new needle valve and seat, a new oil filter, and fresh oil.
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
    Outdoor Power Equipment Expert
    		  
    #4

    Dec 21, 2010, 04:36 PM

    Hi,
    Just an addition to give you that (in)famous YouTube link:
    YouTube - Lawn Mower Repair Valve Adjustment
    It will look a bit different, but the procedure is the same.
    Peace,
    Clarke
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Compression release 15.5 briggs motor [ 3 Answers ]

Hello, I have a 15.5 Briggs and stratton engine on a Snapper mower and from what I have read in other forums I believe the compression release is not working the way it should. Not knowing a lot about engines I have so far replaced the starter (I broke it) the solenoid, and battery cables. The...

Adjust compression release on briggs 12.5 engine [ 2 Answers ]

My 12.5 briggs engine is approx 12-15 yr old. Runs fine when started but won't re-start after shut-off due to too much compression. I need to know where the compression release adjustment (internal I presume) is located and how to adjust it. I have had the solonoid checked & no problem there and...

No compression briggs [ 4 Answers ]

I have a 18.5 Briggs and Stratton engine that was was running fine with a rapping noise then decided to quit. I pulled the plug and it had little to no compression when turned over. The spark was good and it was getting fuel. I pulled the cover off the head and found one of the rocker arms...

Briggs 11.5 Mower engine no compression [ 2 Answers ]

Hello, After 3 hours of continuous use, my Airens riding mower w/ Briggs 11.5hp engine (28D707 model) made a banging noise then quit. Someone other than myself had been running it w/o checking oil. The engine was seized/frozen. Following suggestions from other helpful posts :) in this forum:...

8 horse Briggs compression spec. [ 1 Answers ]

I have an old 8 hp Briggs with 75 psi. . What is the minimum compression psi. to run?

View more questions Search