Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

Briggs & Stratton 18hp Intek


barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

08-30-11, 02:20 PM   #1  
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

 
Sponsored Links
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,567
GA

08-30-11, 06:26 PM   #2  
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.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
38racing's Avatar
Member

Join Date: Oct 2007
Posts: 325
CANADA

08-30-11, 07:15 PM   #3  
If you have oil in the air cleaner it's likely the head gasket, very common on these and not real expensive to fix.

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

08-31-11, 06:14 AM   #4  
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

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

08-31-11, 06:18 AM   #5  
Will check filter later today...thanks

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,567
GA

08-31-11, 09:37 AM   #6  
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?


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

08-31-11, 04:42 PM   #7  
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

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,567
GA

08-31-11, 05:06 PM   #8  
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.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

09-01-11, 05:26 PM   #9  
Thanks Cheese...will follow up on that in a couple of weeks when I have a little more tim....Barrie

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

09-11-11, 06:46 AM   #10  
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

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

09-11-11, 01:38 PM   #11  
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

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,567
GA

09-11-11, 06:29 PM   #12  
The aluminum one goes to the intake.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!


Last edited by cheese; 09-11-11 at 11:48 PM.
 
38racing's Avatar
Member

Join Date: Oct 2007
Posts: 325
CANADA

09-11-11, 06:44 PM   #13  
Posted By: cheese 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.

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,567
GA

09-11-11, 11:49 PM   #14  
Posted By: 38racing 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!


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

09-12-11, 06:29 AM   #15  
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

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,567
GA

09-12-11, 04:09 PM   #16  
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.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
38racing's Avatar
Member

Join Date: Oct 2007
Posts: 325
CANADA

09-12-11, 06:36 PM   #17  
Posted By: barrie 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

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

09-14-11, 03:52 PM   #18  
Thanks for the diagram...I can follow that....Barrie

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

09-14-11, 03:57 PM   #19  
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

 
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,567
GA

09-14-11, 04:39 PM   #20  
Yep, I set both to .005 or less.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
38racing's Avatar
Member

Join Date: Oct 2007
Posts: 325
CANADA

09-14-11, 07:50 PM   #21  
Posted By: barrie 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

 
barrie's Avatar
Member

Join Date: Aug 2011
Posts: 12
Non-US

09-15-11, 01:22 PM   #22  
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

 
Search this Thread