NateG
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Flames coming out of the Exhaust - Briggs Intek 14.5
Good Day everyone, I hope your Friday is going well. I am hitting a brick wall here and could use a little help/advice. I have a DR Power brush hog with a Briggs Intek 14.5HP engine (Model # 31R6770017G1, picture attached). One day I noticed there was a flame coming out of the exhaust and when I either increase the throttle or engage the blade it would shoot out a puff of black smoke. I'm not a mechanic, however, I like to think of myself as fairly knowledgeable on a lot of things. The things I don't know about, I attend Youtube University for a semester. What I've done... I've pulled the engine apart and checked the timing, timing is good (both marks line up), I put everything back together and pulled the flywheel off to see if maybe the flywheel key sheared and it was offset. Nope, flywheel key was intact. I checked valve rocker gaps, made sure it was .004 on exhaust and .007 on intake (maybe other-way around but it got set properly). I pulled the head off to see if maybe the valve wasn't seating properly. Nope, it was seating (I used a carbon remover on the valves to see if it would leak through and to clean the carbon off) and if it wasn't, I would assume the engine wouldn't run... properly. I'm at a loss and any advice is appreciated. Setting valve gap: I've heard a couple of different things here... 1) It's ok to set both to .005 and forget it, 2) .004 & .007 after going 1/4" past TDC, and 3) Tried setting them at TDC but I still get the attached flame out of the exhaust. I can only assume if flames are shooting out of the exhaust it's running too hot and I would rather not run it like that. Thanks, Nate
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/22 19:49:54
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The exhaust valve gets a little hotter so I'd set that at .007", the intake .005" is fine. Where to set can be done different ways. If the intake valve is OPEN, your good to adjust the exhaust and vice versa. I suspect you may have a carb issue, too much fuel . Look at your spark plug and see if it's super black and sooty. That'd confirm it's running rich. Possibly excess fuel making it to the muffler then lighting off.... (I've never seen that issue in a small engine)...
post edited by SRTsFZ6 - 2023/09/22 19:53:19
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/22 19:57:18
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NateG
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/22 21:48:16
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Thank you so much, it gives me some direction... I appreciate the tip about having the intake / Exhaust open when adjusting... I'll give it a shot when the rain stops here and let you know how it goes...
Maybe I'll jut get a new Carb and hopefully that'll be the end of it. I'll verify the valve adjustments haven't loosened up but I did tighten it up pretty tight (not overly tight)
Thanks again.
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/23 08:17:27
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If anything, keep the valves on the loose side.
A partially open exhaust valve WILL allow combustion itself to exit the muffler..
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NateG
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/23 16:20:15
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SRTsFZ6
If you have a NIKKI carb (see attached link) their notorious for leaking internally. Part #137a, there's a very, very small o-ring that "goes away" and leaks over time. It lets fuel out of the carb directly into the head... There's many You Tubes on it so you'll see what to look for...
Is it possible to, if a replacement is needed and I have the Nikki, replace a Nikki carb with the Ruixing? I don't know carbs that well so I would rather know before guessing and wasting money buying something I can't use.
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/24 08:25:07
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I'd avoid a NIKKI if possible... Just a sh...y design..
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/24 08:29:56
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/09/24 08:34:40
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NateG
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/10/11 19:19:12
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SRTsFZ6
Carb part # was found from your model #... Carb "B":
https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/briggs-stratton/briggs-stratton-engine/200000-399999-series/31r600-to-31r699/31r677-0017-g1/carburetors-nikki-ruixning-fuel-supply-kit-carburetor-overhaul
SRT, So here's an update with a follow up question, if you don't mind. I ordered a replacement carburetor, 594593, but received a 595210... looking at a different website the part number 594593 was pulled up but shows pictures with the 595210 part, which makes me think the parts are the same, one is newer. Any input you have on this would be great. Follow up question with a little background... I am still having the issue of the flames coming out of the muffler and noticed, when I was pulling everything apart, there was a hole in the top shroud on the front. I noticed this before but couldn't find anything broken or damaged so I thought something hit it and just broke a hole in it. Well, as I'm pulled more of the top parts off and found the fins had all been broken off. Question: Could the broken fins be causing the engine to heat excessively and the flames caused from the excess heat? My understanding of this engine is those fins move air around the case to keep it cool. I can only assume if the heat builds up too much it may cause this issue.
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/10/12 08:52:59
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☼ Best Answerby NateG 2023/10/16 19:43:31
Quote: Question: Could the broken fins be causing the engine to heat excessively and the flames caused from the excess heat? My understanding of this engine is those fins move air around the case to keep it cool. I can only assume if the heat builds up too much it may cause this issue. ____________________________________________________________________________________ Absolutely that'll cause over heating. That IS your cooling system. ALOT of air is pushed with that fan, and I do mean ALOT.. Possibly close to dieseling getting so hot.. The lack of cooling can also drop an exhaust valve seat, the exhaust valve and seriously damage/destroy the engine.. Don't run it anymore til that's repaired.. I'd look about and see if something went foul and damaged the fins or just some prior person in there tearing stuff up... Re the carb, if the carb controls, throttle, choke, fuel inlet fit, you should be fine. I .
post edited by SRTsFZ6 - 2023/10/12 08:57:02
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NateG
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/10/16 19:16:34
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SRT, latest update, I when I ran it the other day after ~5 minutes there were flames coming out (this was about my last post and the fan). I already ordered a new fan and received it a couple days ago but didn't get it installed until today. Ran it for 10 - 15 minutes, no flames. I really appreciate your help with all of this... just to give you an idea... this is my old fan.
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SRTsFZ6
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Re: Flames coming out of the Exhaust - Briggs Intek 14.5
2023/10/18 08:00:54
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Excellent! Your engine will be much happier too!
Tks for the update.
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