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Water divider with Cannon sidedraft manifold


Chris_B

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I have a pair of NOS Cannon sidedraft manifolds. The head-side flanges seem to be thicker than those on the factory intake manifold. This picture illustrates the problem with an e21 water divider. The difference is about 3 millimeters. I have measured various other water dividers, including one used with the factory downdraft manifold and one for a tii, and found that they are all about 15mm thick (3 mm too short). I don't have the spec for the "ti" water divider.

Has anyone else had this problem? If so, how did you resolve it?

post-185-13667597489499_thumb.jpg

Chris B.

'73 ex-Malaga

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Yup!

Find a file and take manifold in hand and have at it until it is the same height as the water neck or else you gonna have a leak!

A radiator shop is a good place to take a leak.

 

I have no idea what I'm doing but I know I'm really good at it.

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OR get a Nissan exhaust washer and put a step in that.

They're about 6mm thick, and are designed to rock quite a bit to

take care of this sort of problem- the same stud holds the intake and

exhaust on the R, U and L- series motors...

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Damn! The ironic thing is that my previous setup was a Lynx single sidedraft manifold, which was about 3mm thinner than the water divider flange and the factory downdraft manifold. I ground down my water divider to be compatible with the Lynx manifold. Then, when I went to install the Cannon manifold, there was a big difference in the thickness between the Lynx modified divider and the Cannon manifold (perhaps, 6mm). So, I thought that the modified water divider that I had was so much thinner than the Cannon manifold because I had modified it for the Lynx setup. Not so- the Cannon is 3mm thicker than the factory manifold. Go figure.

Chris B.

'73 ex-Malaga

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Tom Jones

BMW mechanic for over 25 years, BMWCCA since 1984
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 585k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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Thanks, Tom. The problem is that there is very little clearance for a washer on the stud... perhaps 1-2mm. Here is a grossly out of focus pic that illustrates that. When I first installed the Cannon manifolds, I fabricated a spacer from a piece of pipe I found at the local hardware store, and I ground down a washer to use with it. That spacer had to be pretty thin to fit, and I had to crank the nut down very firm on the stud to seat the water divider properly. I am looking for a permanent solution, and it appears at this point that I will be removing the intake manifold and grinding down the flange to match the flange on the water divider.

post-185-13667597506591_thumb.jpg

Chris B.

'73 ex-Malaga

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If you have a drill press,

you could mount a spotface cutter in it, and use that.

Thing is, a spotfacer will probably cost more than a machine shop would

charge...

I suppose a very small flycutter would work, too....

I use the spotfacers for putting oil temp sensors into the diffs and trannies-

if you fixture up the part, you then can drill, spotface and tap it all in one setup,

guaranteeing a surface perpendicular to the threads you just tapped...

and it makes you feel like a real machinist for a fraction of the price!

heh

t

post-611-13667597542051_thumb.jpg

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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Sorry for nit picking but those fuel pump nuts are going to back off if you don't either change those flat washers for wave lock washers or use blue loctite on the threads... :-b....

Anyways, I should but don't know of any machinists in the Santa Cruz area but Arnie Carlson a friend of mine that's up in the S-Cruz mountains should... email me for his email, and tell him I sent ya'.

Tom Jones

BMW mechanic for over 25 years, BMWCCA since 1984
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 585k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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