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John Deere Tractors Discussion Forum

Manifold installation on 531 JD engine

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6030MATT

01-24-2008 18:30:38

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Hello

Wondering if there are torque specifications for the manifold bolts. I have the technical manual and it does mention any torque specs for the manifold. Also are manifold gaskets usually installed dry?

Thanks in advance for any advice.

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01-25-2008 08:43:50

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Re: Manifold installation on 531 JD engine in reply to 6030MATT, 01-24-2008 18:30:38

You can use a straight edge like a framing square to get a good idea how flat your manifold is. When you torque the manifold work from the center to the outside. Use a two step torque, say 25 then 55 ft lbs. Do a final torque with the engine at opeating tempature.

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rexhellwig

01-24-2008 19:47:25

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Re: Manifold installation on 531 JD engine in reply to 6030MATT, 01-24-2008 18:30:38

Install the gaskets dry. I've seen some cases where silicone or permatex makes the intake to gasket joint "slick", allowing the gasket to squeeze out over time. It you HAVE to use something to simply aid in installation, 3M type weatherstrip glue won't cause any slip problems.

If using the grade five 7/16 bolts, I would tighten them to at least 50, but not over 55 ft-lbs. {use anti-sieze paste on the exhaust threads} If your manifold and head surfaces are in good shape, you won't have any problems.

The later high output versions of this engine will develop problems with the cylinder head "dissolving" away at the siameze exhaust ports after a few thousand hours of hard use. This surface can be welded up and re-surfaced with very good success. It saves a VERY expensive head. Deere adopted flanged head, higher strength bolts for this application, but the lengths are not the same as used on 531 exhaust manifolds.

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jd40an

01-25-2008 09:36:06

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Re: Manifold installation on 531 JD engine in reply to rexhellwig, 01-24-2008 19:47:25

My 7520 blew an exhaust manifold gasket because of this "erosion" at the "eyebrows" on the head. I first just replaced the gasket(after buying a new exhaust manifold to replace the badly cracked original), but the gasket blew at the "eyebrow" again. Not wanting to pull the head unless I really had to, I "mickey moused" a repair by using parts of other new gaskets to double the thickness at the "eyebrows". I also purchased some "furnace cement" and sort of "glued" it all together! I let this set a day or two to harden, then started the tractor & let it idle a while to "cure" the cement with heat, before putting it under load. This repair has probably 2000 hrs. use with no further trouble.

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6030MATT

01-24-2008 20:53:47

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Re: Manifold installation on 531 JD engine in reply to rexhellwig, 01-24-2008 19:47:25

Thanks rex

Yes i am seeing what you mean by the dissolving around the two twin exhaust ports. There not terrible so im going to try and run with them until an overhaul. Will these gaskets seal up reletivly well with no leaking or is it a difficult task to get a seal with no leaking.

Thanks again

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rexhellwig

01-25-2008 04:16:47

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Re: Manifold installation on 531 JD engine in reply to 6030MATT, 01-24-2008 20:53:47

Everything is going to depend on how square the mating parts are. Mount up the exhaust manifold without the gaskets and start poking feeler guages between the manifold and head. This will give you an idea on how good your parts are. I wouldn't worry too much if you are able to slip a .004 or .005 in. guage in a place or two. But if it's .015 or .020, it's probably not going to work.

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6030MATT

01-25-2008 15:03:08

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Re: Manifold installation on 531 JD engine in reply to rexhellwig, 01-25-2008 04:16:47

Thanks Guys for all the help and advice, gonna work on it this weekend and i will let you know how It comes out.

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rexhellwig

01-25-2008 18:05:55

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Re: Manifold installation on 531 JD engine in reply to 6030MATT, 01-25-2008 15:03:08

We hereby bestow upon MATT an honorary doctorate degree in 531 manifolding. Henceforth, he shall be considered a master in his field, the final word in his trade, and a purty darn good mechanic, too.

Good luck!

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