Briggs OHV valve clearances - Snowblower Forum : Snow Blower Forums
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post #1 of 11 Old 01-30-2018, 01:20 AM Thread Starter
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Briggs OHV valve clearances

Hi guys,
I need some help figuring out what the valve clearances are supposed to be on a Briggs OHV 20G414-0111-E1 12hp snowblower engine.I believe it is a 2003 engine on a Simplicity.

I've consulted multiple sources that conflict with each other.

I don't have the owner's manual for the engine so I went to the Briggs website and downloaded two of them.Both of them give the spec. .004/.006 intake,.009/.011 exhaust.

Strangely enough,these owner's manuals refer you to Briggs repair manual #272147,which is a Vanguard manual,not Intek, which the subject engine is.Nowhere in the Vanguard manual is my engine model mentioned.

If I consult the Briggs OHV manual #276781,under the series 200000,the clearances are given as .004/.006 for both valves.

Anyone have any idea what the correct clearance is for the exhaust valve on this engine?Thanks much.
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post #2 of 11 Old 01-30-2018, 01:53 AM
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Intek Manual says:

Intake . . . . . . . . . . . . . 0.004 – 0.006 in. (0.10 – 0.15 mm)
Exhaust . . . . . . . . . . . 0.009 – 0.011 in. (0.23 – 0.28 mm)

https://www.briggsandstratton.com/na...20G414-0111-E1

Makes sense to me to have the exhaust valve set a hair wider than the intake, regardless... that's what I'd go with anyhow.


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post #3 of 11 Old 01-30-2018, 11:42 AM Thread Starter
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Quote:
Originally Posted by Yanmar Ronin View Post
Intek Manual says:

Intake . . . . . . . . . . . . . 0.004 – 0.006 in. (0.10 – 0.15 mm)
Exhaust . . . . . . . . . . . 0.009 – 0.011 in. (0.23 – 0.28 mm)

https://www.briggsandstratton.com/na...20G414-0111-E1

Makes sense to me to have the exhaust valve set a hair wider than the intake, regardless... that's what I'd go with anyhow.
That's where the confusion lies-Those owner's manual's that you link to gives .009-.011 on the exhaust valve.However,my Briggs OHV service manual that covers that engine says .004-.006 for both valves and most of the other engines as well.

From repair manual:

http://tinypic.com/r/dmta2c/9

Outdoorpowerinfo.com:

200000 OHV Single Cylinder .004 / .006 .004 / .006

Last edited by Mike C.; 01-30-2018 at 12:06 PM.
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post #4 of 11 Old 01-30-2018, 12:44 PM
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Well... a common thing to see on many engines is intakes set at .010, exhaust at .015 (mm).

Have you measured where it's at now for any clues?

If you're worried then go .025 on the hot side and see how it goes, if you get excessive clatter you can always crank it back in a hair... agreed that ex. side spec sounds a little wide but it's better to hear 'em than to smell 'em.


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post #5 of 11 Old 01-30-2018, 01:22 PM
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Stick with what the Intek Service Manual says. I've used those valve spec numbers with great success.
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post #6 of 11 Old 01-30-2018, 01:24 PM
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found the same on line,..004 to .006, just like my kohler, i use 3 gauges 4-5 and 6, set to the 5 .the 6 should be a nogo or very tight .the 4 slides under.
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post #7 of 11 Old 01-30-2018, 11:29 PM Thread Starter
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Well,
I decided to go to the manufacturer and asked them to clear it up, using their online chat system.They got back to me almost immediately and stated that .004-.006 for both valves was correct.

I noticed another thing about this engine I find interesting-the 12hp rating Briggs gives it.The other manufacturers rate their 300cc class engines in about the same torque range,14-14.5 ft/lbs.,but most of them are only rated from about 8.5-maybe just under 10hp max.Briggs was definitely fudging the numbers on this engine.

Thanks for the help,gentlemen.
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post #8 of 11 Old 01-30-2018, 11:38 PM
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Stupid question, if you didn't have the clearance, could you set them with the engine running? The rockers look just like any other rocker, do they adjust the same?
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post #9 of 11 Old 01-31-2018, 07:38 AM
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Mike C.

there was a class action law suite about 10 years ago about OPE engines not being the hp claimed, all had been found to be over rated.by using another sae rating, example is a 10 hp tech was found to be 9, a 25 hp SV series kohlor was really 23, costly end result tech went under, many ope owners got some cash back, others dropped engine lines and came out with new motors. i'm not up on most, but know kohler dropped the sv parts included for whats now the kt line,
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ope engines are set cold not running, it's not easy to play with tiny poly locks used on these toys when off never mind running,
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post #10 of 11 Old 01-31-2018, 10:31 AM Thread Starter
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Quote:
Originally Posted by 87 powershift View Post
Mike C.

there was a class action law suite about 10 years ago about OPE engines not being the hp claimed, all had been found to be over rated........,
Yes,that's what I was hinting at..

Honda,fairly recently,started using a new method which resulted in a lower HP rating for their engines.The GX200,for example,is now rated at 5.5hp instead of the previous 6.5hp.
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