Briggs and Stratton Warped PLASTIC Intake Manifolfd

[StarTech]

If some of you learn what an in/lb wrench is for would help. Carb to manifold 65 in/lbs (5.4 ft/lbs); Manifold to cylinder head 80 in/lbs (6.7 ft/lbs). Over tightening the screws is a leading cause of the warpage. Yes heat plays a part too.

 

[Forest#2]

I agree. Bring back the Briggs Lhead twin engines.

Amen

 

[Neo7]

If some of you learn what an in/lb wrench is for would help. Carb to manifold 65 in/lbs (5.4 ft/lbs); Manifold to cylinder head 80 in/lbs (6.7 ft/lbs). Over tightening the screws is a leading cause of the warpage. Yes heat plays a part too.

That's all good but these are just lawnmower engines and many people working on them don't have such tools (yes I do). The problem is really with Brigg's choice of materials and not the guy just trying to get his mower going.
Anyway one Aluminium Manifold is now a quarter the cost of a whole replacement engine, so a tried and tested method of plastic manifold repair makes a lot of sense.

 

[Neo7]

Ok Guys, I was not keen on sanding that flat surface so a trip to the machine shop is how I fixed up my plastic manifold … I then treated the plastic with Loctite 770 and used Caster Epoxy (and two stainless steel rods) across (bridging) the gaps to ensure the mating surface stays flat in the long term. I also filled in those 4 holes on the flat surface with the Epoxy too. I can't see why B&S would want those holes there... except to intentionally cause failure at a later date.