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Need Help Working On A B&s Engine


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#1 thadscub OFFLINE  

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Posted March 27, 2014 - 12:51 AM

hi guys i have purchased a old montgomery ward  snowblower i need to replace the missing screws on the intake manifold both the bock and carb anyone know what size they are and what the headbolts are are they just grade 8 bolts and what thread and size

 the engine in question is  a model 170402 type 0644 01 and code 6906131

 

thanks thad



#2 boyscout862 ONLINE  

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Posted March 27, 2014 - 06:23 AM

Try the Manuals Section for a parts list. The Repairmans Manual is excellant. Good Luck, Rick



#3 trowel OFFLINE  

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Posted March 27, 2014 - 08:53 AM

1/4-20 1 inch long for the intake manifold to engine block.

 

7/16-18  4 to 4 1/2 inch long for the head bolt taking into account the fuel tank bracket, many will say grade 8 is fine but very hard, IMO grade 5 is better, don't use lock washers, if you do use softer steel or regular washers or it will crack the head when you torque it to specs.


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#4 thadscub OFFLINE  

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Posted March 27, 2014 - 01:46 PM

anyone know what the screw size is for the intake manifold to carborator takes

 

thanks thad



#5 trowel OFFLINE  

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Posted March 27, 2014 - 08:57 PM

anyone know what the screw size is for the intake manifold to carborator takes

 

thanks thad

Also 1/4-20, should be 1'' or 1 1/2 '' long.


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#6 thadscub OFFLINE  

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Posted April 01, 2014 - 03:04 AM

are they coarse or fine thread for the head bolts



#7 Bruce Dorsi ONLINE  

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Posted April 01, 2014 - 05:01 AM

are they coarse or fine thread for the head bolts

 

The head bolts are 5/16" - 18 thread which is the standard coarse thread for a 5/16" bolt.

 

The fine thread (aka SAE thread)  which you don't want is 5/16" - 24 (threads per inch).


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#8 thadscub OFFLINE  

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Posted April 04, 2014 - 03:09 AM

anyone now lengths for the headbolts



#9 Bruce Dorsi ONLINE  

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Posted April 04, 2014 - 06:56 AM

anyone now lengths for the headbolts

 

There is not a simple answer to your question.

 

B&S used at least 2 different lengths on your 7hp engine.  ....Three (3) longer bolts are 2-21/32" long, and are used in the corner of the head around the exhaust valve.   ....The shorter bolts are 2-5/16" long, and are used for the other head bolts.

 

What complicates the issue, is if the gas tank, brackets, or other accessories are fastened to the engine under the heads bolts, longer bolts or special studs were used.  ...Sometimes spacers were used to gain height to clear the fins on the head, so extra-long bolts were used.

 

The B&S parts manual for your model & TYPE number would specify what head bolts your engine originally had.  ....There is a parts manual in the Manuals Forum : http://gardentractor...70400-to170466/ but I can not get the file to open for me. ....Maybe you'll have better luck?






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