Briggs & Stratton 18hp Intek

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  #1  
Old 08-30-11, 02:20 PM
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Briggs & Stratton 18hp Intek

I have a 7 year old Craftsman lawn tractor that has just started to smoke "burning oil" what woyld be the most likely cause and approximate cost to repair
 
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  #2  
Old 08-30-11, 06:26 PM
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Too much oil in it? Could be the carb leaking gas into the crankcase. I don't know what engine you have, some carbs are easier to fix than others so the cost to fix may vary. Probably less than $100 and possibly half that.
 
  #3  
Old 08-30-11, 07:15 PM
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If you have oil in the air cleaner it's likely the head gasket, very common on these and not real expensive to fix.
 
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Old 08-31-11, 06:14 AM
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Oil level goes down after mowing for 4 hours which leads me to think crankcase is not filling with fuel. Is B&S 18hp intek single cylinder
 
  #5  
Old 08-31-11, 06:18 AM
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Will check filter later today...thanks
 
  #6  
Old 08-31-11, 09:37 AM
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Ok, the single cylinder inteks do occasionally have blown head gaskets. That's a real possibility, however, gas in the oil is even more common and I would eliminate that before looking to the head gasket. Does the oil smell like gas?
 
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Old 08-31-11, 04:42 PM
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The air filter is clean and dry and to me the oil does not smell of gasoline. Would it be far more likely to be a head gasket than rings or valve guides (if they have them). This has been maintained faithfully and have been using synthetic oil for the last 3 of its 7 years
 
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Old 08-31-11, 05:06 PM
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Yes, much more likely to be the head gasket than rings or valve guides. Valve guides don't really cause much smoke unless they are really bad, and either wouldn't cause it to start smoking all of a sudden. A head gasket would.
 
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Old 09-01-11, 05:26 PM
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Thanks Cheese...will follow up on that in a couple of weeks when I have a little more tim....Barrie
 
  #10  
Old 09-11-11, 06:46 AM
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Hi Cheese....Have picked up a gasket set and borrowed a torque wrench form a neighbour, will get at it tomorrow. Could you tell me the Cyl head torque setting and is ther any spaecific pattern....this seem hard to find......Anything that I should be aware of or is it pretty straight forward....Thanks barrie
 
  #11  
Old 09-11-11, 01:38 PM
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Hi Once again.......I've got it apart and yes there was a slight break in the narrow part of the gasket....have got it all clean and ready to put back together tomorrow...I seem to have 1 metal push rod and 1 aluminum rod and as they both fell out together is there a specific one for intake and exhaust.....thanks in adavance ....barrie
 
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Old 09-11-11, 06:29 PM
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The aluminum one goes to the intake.
 

Last edited by cheese; 09-11-11 at 11:48 PM.
  #13  
Old 09-11-11, 06:44 PM
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Originally Posted by cheese View Post
The aluminum one goes to the exhaust.
on the single intek the aluminum is on the intake (has the compression) release and steel on the exhaust. that intek is a 31series.

from the manual
NOTE: On models 210000, 280000, 310000,
330000 the intake push rod (lower, aluminum) is
hollow and the exhaust push rod (upper, steel)
has a red band of paint for identification.
 
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Old 09-11-11, 11:49 PM
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Originally Posted by 38racing View Post
on the single intek the aluminum is on the intake (has the compression) release and steel on the exhaust. that intek is a 31series.

from the manual
NOTE: On models 210000, 280000, 310000,
330000 the intake push rod (lower, aluminum) is
hollow and the exhaust push rod (upper, steel)
has a red band of paint for identification.
Correct! I have edited my post to reflect this. Thanks for catching my mistake!
 
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Old 09-12-11, 06:29 AM
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Getting there

Thanks for clearing that up....1, metal rod for upper exhaust & 2, aluminum for lower intake.

Is there a correct torque pattern and what is the correct setting, I can't seem to find this any where
 
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Old 09-12-11, 04:09 PM
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220 inch lbs, tighten them in a criss-cross pattern until all of them are tightened. I prefer to go to 200 or 210 in lbs to snug it all up, then re-torque them all to 220 in lbs.
 
  #17  
Old 09-12-11, 06:36 PM
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Originally Posted by barrie View Post
Thanks for clearing that up....1, metal rod for upper exhaust & 2, aluminum for lower intake.

Is there a correct torque pattern and what is the correct setting, I can't seem to find this any where


5 2 4

8

6
3 1 7

can't seem to get the 3 1 7 a little to right of 6
 
  #18  
Old 09-14-11, 03:52 PM
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Thanks for the diagram...I can follow that....Barrie
 
  #19  
Old 09-14-11, 03:57 PM
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Thanks Cheese you were right on...the gasket seems to have cleared up the problem and appears to run fine. I set the valve clearance to 4 thou for intake and 6 for exhaust and at times it is very reluctant to turn over without a couple of seconds pause, I assume I will have to change one of these clearances a little.....Thanks
 
  #20  
Old 09-14-11, 04:39 PM
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Yep, I set both to .005 or less.
 
  #21  
Old 09-14-11, 07:50 PM
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Originally Posted by barrie View Post
Thanks Cheese you were right on...the gasket seems to have cleared up the problem and appears to run fine. I set the valve clearance to 4 thou for intake and 6 for exhaust and at times it is very reluctant to turn over without a couple of seconds pause, I assume I will have to change one of these clearances a little.....Thanks
Try getting the .003 on the intake
 
  #22  
Old 09-15-11, 01:22 PM
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Hi Cheese & 38 Racing, I have reset gaps to 004 on both and it doesn't seem to be running to badly at all. I will run it for a few days and see how it goes, if i need to go further I will tighten up the intake a touch. Thanks to both of you for the information your help seems to have resolved my problem & hope it stays that way....Barrie
 
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