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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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very strange mower problem
I was working on a friends mower, 13.5 BS engine.
as soon as I cranked it I could tell it no compression. turns out BOTH in and out valves were too tight and not closing. there was also a bolt broken off on the valve cover. now the mower is not that old/not much use and it is owned since new buy a mother and daughter. she swears no one else has worked on it. the million dollar question, how the heck did BOTH valve get so tight they wont close. I am not talking just a little too tight, I had to turn the adjuster a good bit. I can get it to fire but the needle valve in the carb is bad and it is now flooding.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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07-17-2018, 03:53 AM
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Still Doin Time
Join Date: Nov 2004
Location: Nokesville, Va.
Posts: 8,225
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Only thing I can think of is if the adjusters were the cause and you had to back them off, the lock nuts weren't tight -OR- if there aren't lock nuts it would have to have interference threads to keep them from turn during operation, they weren't machined properly........
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'15 Dodge - 'Dango R/T Hauls groceries and Kinda Hauls *ss '07 Jeep SRT-8 - Hauls groceries and Hauls *ss Sold '85 Guards Red Targa - Almost finished after 17 years '95 Road King w/117ci - No time to ride, see above '77 Sportster Pro-Street Drag Bike w/93ci - Sold |
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07-17-2018, 04:01 AM
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You do not have permissi
Join Date: Aug 2001
Location: midwest
Posts: 39,910
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Could the cam bearings have worn on the block side from the chain being too tight? Hail Mary
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07-17-2018, 05:26 AM
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Join Date: Aug 2002
Location: MD
Posts: 5,733
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Ever change the oil? Air filter plugged? No oil could wipe the cam.
Interesting issue |
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07-17-2018, 07:17 AM
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Join Date: Sep 2009
Location: North of You
Posts: 9,160
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Crate engine.
Interesting problem. I'm guessing low oil. Could the valve cover have leaked as a result of the missing bolt?
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands." |
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07-17-2018, 07:42 AM
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weekend wOrrier
Join Date: May 2011
Posts: 6,262
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Find a Briggs and stratton/small engine forum. Some of the BS engines had cam failures which symptoms mimick valve adjustment issues.
This got me looking at the internet which mentioned specifically 31 series engines. Guess what engine I have? 31 series. THANKS A LOT!!!!! |
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07-17-2018, 07:43 AM
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Join Date: Oct 2006
Location: MYR S.C.
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first thing I did was check oil, a woman owns it...it was clean.
mower is an 09 and has not run in 3 years. it still looks new. SOMEONE had to have adjusted them. the broken screw on the valve cover??? not from the factory.....I hope. cam wear would loosen them up. bent push rod would loosen them up. rocker adjusters were tight It runs for about 10 sec, bad float needle, and it sounds fine. no knocking, no rattles. I just thought this was very odd and had to share. it seems like B&S is wasting $$$. there are SO many variations of basically the same engine. its not like they are making improvements. all the $$ just in different carbs, that cant be practical. how many do you need for a 13hp engine??
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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07-17-2018, 08:39 AM
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Quote:
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07-17-2018, 12:19 PM
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Join Date: Jul 2003
Location: Valencia Pa.
Posts: 8,859
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If the valve seats, or valve faces were experiencing some serious wear, the valves would retreat up into the head, making them tight .
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No left turn un stoned |
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07-17-2018, 01:01 PM
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Join Date: May 2004
Location: Lake Cle Elum - Eastern WA.
Posts: 8,417
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Camshaft has compression release system built in. These often go bad....
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Bob S. 73.5 911T 1969 911T Coo' pay (one owner) 1960 Mercedes 190SL 1962 XKE Roadster (sold) - 13 motorcycles |
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07-17-2018, 02:11 PM
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I don't think that's the problem here. Somebody's been into this thing - somebody who didn't know what they were doing.
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07-17-2018, 05:13 PM
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Join Date: Sep 2001
Location: Dismal Nitch, AZ
Posts: 9,042
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^^^
Is the valve cover crushed where the broken bolt is?
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Don . "Fully integrated people, in their transparency, tend to not be subject to mechanisms of defense, disguise, deceit, and fraudulence." - - Don R. 1994, an excerpt from My Ass From a Hole in the Ground - A Comparative View |
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07-17-2018, 06:29 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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Quote:
I have heard about that compression release but don't know anything about it. I don't know why she would not tell me someone else worked on it. I found the porcelain broken on the spark plug. not sure if it would keep it from running but I suspect it did and someone tried to fix it and adjusted the valves. seems pretty odd they would try to adjust valves and not check the plug though. I suspect this will go down with the Kennedy assassination mystery
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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07-18-2018, 02:56 AM
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Counterclockwise?
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Did it run the last time she tried to start it 3 years ago?
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Rod 1986 Carrera 2001 996TT A bunch of stuff with spark plugs |
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07-19-2018, 09:38 AM
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Join Date: Oct 2006
Location: MYR S.C.
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no, that's why I have it.
the story is a little sketchy. supposedly she went to start it and it would not start.
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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07-20-2018, 03:36 AM
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