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Subject: Cracked Manifold

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Jon Rhee (RI)    Posted 05-01-2017 at 00:02:32 [URL] [DELETE]        [Reply] [Email]  
  • Cracked Manifold
  • So I'm working on my Jacobsen - its got a Ford 192 CI industrial engine in it. My intake manifold has a hairline crack on one side of the pipe at the mounting flange. It does go through the wall. Can I braze that? or JB weld it? Or is it just better to buy an aftermarket manifold for $90 bucks?

    Tim Daley(MI)    Posted 05-01-2017 at 08:06:23 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Cracked Manifold
  • HiYa Jon!!! Long time, bro. Is the manifold cast iron? If so, brazing is the ticket and if you don't plan on doing it yourself take it to your trusty local engine rebuild hop and get their opinion and an estimate for their services. Then evaluate the cost of getting a new aftermarket unit. Maybe get a new one and repair the old one if it can be as a spare.

    Tim Daley(MI)

    Jon Rhee (RI)    Posted 05-04-2017 at 18:02:16 [URL] [DELETE]        [Reply] [Email]  
  • Re: Cracked Manifold
  • Tim,

    My manifold was bolted on using what look like original bolts but no washers.... the bolt heat tightens to the cast iron manifold. Is that correct? Jon

    Jon Rhee(RI)    Posted 05-03-2017 at 12:03:46 [URL] [DELETE]        [Reply] [Email]  
  • Re: Cracked Manifold
  • Hey Tim - Hope all is well with you! I decided to have the manifold brazed. My go-to guy here is a tool and die welder.....had all these fancy laboratory looking aluminum tubes out front that he had been welding. Anyway - he's not inexpensive but I'm sure the job will be done correctly. He said he would braze it and that he had to heat the whole manifold in the oven first and then braze it. Makes sense. It's $140. I was looking at some of the manifolds on eBay and they look absolutely dreadful...couldnt bring myself to buy one of those which are $90 after shipping anyway. Mine is cosmetically in great shape and the flange is nice and clean....still has all the blanchard marks from the original factory planing/grinding. Jon

    Larry    Posted 05-01-2017 at 07:48:56 [URL] [DELETE]        [Reply] [Email]  
  • Re: Cracked Manifold
  • It's my opinion you can weld it. Depends on how good of a welder you are. Years ago I took some welding classes and the instructor brazed a couple manifolds to show us how it can be done. He was very good. Now they have rods for welding cast. If it's in good shape it would most likely be better than the aftermarket.

    Jon Rhee(RI)    Posted 05-03-2017 at 12:06:43 [URL] [DELETE]        [Reply] [Email]  
  • Re: Cracked Manifold
  • Hi Larry,

    Thanks for your input. I did decide to have it brazed. The fellow turned it around in a day. I dropped it off at noon yesterday and he just called me... I'll let you guys know how it came out.
    Jon

    36 coupe    Posted 05-23-2017 at 19:29:55 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Cracked Manifold
  • I use a carbon arc torch for brazing.Preheat the part and braze.Use a gas grill to preheat.Braze and keep the part on the grill and lower heat slowly.

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