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Backfireing

Oct 24, 2020#1

Rlm20001

I have a 2019 bronco 42 auto. 23 Hp ?
It has been running fine with no problems until today. Today while mowing there was a slightly loud click, at which time with engine increase very slightly in speed (RPMs) and there was a whining noise. I turn off the engine to check and could not find anything wrong. Now I have difficulty starting the engine. When cranking, the engine fails to make a complete cycle, stopping at the point of what appears to be the maximum compression position of the piston. When it does attempt to start, it backfires. The piston moves, the spark plug is clean, the magnetos & magnet are clean.The gas is fresh and there is oil in the crankcase. Please help, I’m stumped.

Oct 24, 2020#2

Scrubcadet10

Twin cylinder correct? give us the engine model also, should be stamped on the valve cover.
I'm thinking a Camshaft issue or a Push rod hopped off a rocker...

Oct 25, 2020#3

Rlm20001

Scrubcadet10 said:
Twin cylinder correct? give us the engine model also, should be stamped on the valve cover.
I'm thinking a Camshaft issue or a Push rod hopped off a rocker...

I believe only one cylinder. But I’ll check to make sure. I think it’s funny that I may be off my rocker.

Oct 25, 2020#4

Rlm20001

Oct 25, 2020#5

Scrubcadet10

Model shows it as a 19HP Briggs Intek single cylinder,
at this point i would remove the valve cover, and also the spark plug so you can spin the engine easier by hand and you want to watch the valves move up and down, make sure they both travel the same amount, and you also want to look for the Compression release to bump the valve, i think on this engine it is on the intake valve (carb side).
Also give us the model number that is stamped on the valve cover so we can see which particular Intek you have.

Oct 25, 2020#6

PTmowerMech

Scrubcadet10 said:
Model shows it as a 19HP Briggs Intek single cylinder,
at this point i would remove the valve cover, and also the spark plug so you can spin the engine easier by hand and you want to watch the valves move up and down, make sure they both travel the same amount, and you also want to look for the Compression release to bump the valve, i think on this engine it is on the intake valve (carb side).
Also give us the model number that is stamped on the valve cover so we can see which particular Intek you have.

Wouldn't the CR always be on the exhaust? So that the compression has a way out quicker?

Oct 25, 2020#7

Fish

Put up a pic of the numbers on the valve cover, then remove it and take a pic of the innards.
Only takes removing 4 bolts with a 10mm wrench.

Oct 25, 2020#8

Scrubcadet10

PTmowerMech said:
Wouldn't the CR always be on the exhaust? So that the compression has a way out quicker?

Not all of them, some go out the intake, i think it was an EPA deal...not sure though

Oct 25, 2020#9

Rlm20001

Rlm20001 said:
View attachment 54695 View attachment 54695

Fish said:
Put up a pic of the numbers on the valve cover, then remove it and take a pic of the innards.
Only takes removing 4 bolts with a 10mm wrench.

Scrubcadet10 said:
Model shows it as a 19HP Briggs Intek single cylinder,
at this point i would remove the valve cover, and also the spark plug so you can spin the engine easier by hand and you want to watch the valves move up and down, make sure they both travel the same amount, and you also want to look for the Compression release to bump the valve, i think on this engine it is on the intake valve (carb side).
Also give us the model number that is stamped on the valve cover so we can see which particular Intek you have.

Oct 25, 2020#10

Rlm20001

Fish said:
Put up a pic of the numbers on the valve cover, then remove it and take a pic of the innards.
Only takes removing 4 bolts with a 10mm wrench.

I keep getting a message that the file is too large

Oct 25, 2020#11

Rlm20001

Oct 25, 2020#12

Rlm20001

What is the largest file thatI can send

Oct 25, 2020#13

Scrubcadet10

yep, you have the notorious 793880 camshaft, known for the compression relief failing, it usually takes out the governor/oil slinger too.
the new camshaft is upgraded and changed to 84005207

Oct 25, 2020#14

Rlm20001

What is my best action at this point? Would the warranty help, or did I void the warranty by working on it.

Oct 25, 2020#15

Fish

Rlm20001 said:
I keep getting a message that the file is too large

Send me a p.m., and I'll give you my e-mail address. I'll try to post them for you.

Oct 25, 2020#16

Rlm20001

Rlm20001 said:
What is my best action at this point? Would the warranty help, or did I void the warranty by working on it.

The rocker arms do have a little play regardless of where is the lifters are

Oct 25, 2020#17

Rlm20001

Fish said:
Send me a p.m., and I'll give you my e-mail address. I'll try to post them for you.

How do I send a PM

Oct 25, 2020#18

Fish

Rlm20001 said:
How do I send a PM

I just sent you one. click on the little envelope icon at the top right of the page.

Oct 25, 2020#19

Rlm20001

Fish said:
Send me a p.m., and I'll give you my e-mail address. I'll try to post them for you.

How do I send a PM

Oct 25, 2020#20

Fish

If you see my private message, just hit reply on it, .
I already sent you my e-mail on it. just send the pic to me there, if you want.

Oct 25, 2020#21

Fish

Here. See if this works..

Oct 25, 2020#22

Fish

I circled the area I want you to check. It looks like your engine has those valve buttons/caps on the end of them. Look and make sure you haven't lost one.

Oct 25, 2020#23

Rlm20001

I noticed there was was a total lack of oil in around the lifters

Oct 25, 2020#24

Rlm20001

Fish said:
I circled the area I want you to check. It looks like your engine has those valve buttons/caps on the end of them. Look and make sure you haven't lost one.

View attachment 54703

Oct 25, 2020#25

Rlm20001

Does this help

Oct 25, 2020#26

Fish

Here are his last 2 pics.
Do you have a set of feeler gauges?
Turn the engine by hand while watching the action of the valves. Watch both rocker arms and see if they travel @ the same distance when moving. One of them might not move much.

Oct 25, 2020#27

Rlm20001

OK, Fish, I’ll do that tomorrow when the rain stops. Thank you very much.

Oct 25, 2020#28

Rlm20001

Just so I will know tomorrow. What is the clearance that I should be looking for and setting?

Oct 25, 2020#29

Fish

Briggs and Stratton Valve Clearances

outdoorpowerinfo.com

Oct 27, 2020#30

Rlm20001

Fish said:
Briggs and Stratton Valve Clearances

outdoorpowerinfo.com

Hi Fish, this is RLM20001 I checked the movement of the valves, the top valve is moving 11.49 mm (.453 in) the bottom valve is moving 11.37 mm or (.447 in) the piston moves approximately 88.61 mm or (3.89 in)
With the plug-in and turning by hand, it seems to have the most compression when both valves were closed.

Oct 27, 2020#31

Rlm20001

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Backfireing

Briggs and Stratton Valve Clearances

Briggs and Stratton Valve Clearances

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