Manifold spacers location

[FreshZ]

I searched quite extensively, but have not found an online image or guided instructions for where the manifold spacers go. when I removed the manifold, I wasn't able to see where the spacers were coming off of, so I couldnt record where to put them back.

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[Zed Head]

"spacers" isn't enough information.

[FreshZ]

well as far as what connects the manifolds to the block are just bolts/studs, washers, and "spacers" - basically thick looking washers

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[7tooZ]

Put one each on the stud that is in between the exhaust manifold and the intake. They allow you to tighten both using the stud. They don't go on the manifolds where there is a hole. I usually start with the exhaust and the add the intake. Torque them all a little at a time evenly until tight. I usually torque again after heat cycle. Assuming we are are talking about an S30 engine.


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[FreshZ]

yes. I have the 75 280z stock L28 engine. I thought that was how they would attach, and now your description confirms this. Thank you very much 7tooZ (clever handle "name 72" by the way)

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[7tooZ]

Good time to install new studs if you haven't started yet. The ones on each end are the most prone to snapping off.


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[FreshZ]

I'm looking into which stud set to get. one set has the studs with all thread and another set has double-ended threaded studs (with the non-threaded are about midway of studs)

Is there a difference if it's all thread or double ended thread studs?

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[Zed Head]

Nissan calls them "yokes".  Clamps or clamping washers might be descriptive also.  But they don't provide a space, so...

http://www.carpartsmanual.com/datsun/Z-1969-1978/engine-280z/manifold-egr/from-aug-76

Note that they're curved also.  The top of the curve should be under the nut, with the edges on the manifold.  Also note that Nissan did not use washers, flat or lock, although people often add them anyway when they do work there.

Put some time in to those small areas.  Clean up the rust and corrosion from surfaces that touch, and if you reuse the studs and/or nuts, clean up the threads.  The nuts aren't torqued very tight so any thread crud can screw up your readings.  Crud at a mating surface can move later also, screwing things up.  It's difficult to get a good exhaust seal that lasts a long time.  Many people end up living with small leaks, "until next time".

[Zed Head]

You can still get Nissan studs and nuts from your local dealer.

[FreshZ]

I've read through a lot of articles, and I haven't seen anywhere where there is a call for clamping washers at the manifold area.

zstore.com also has a set of manifold studs, washers, and spacers.

can someone else chime in to confirm that the headers need a clamping washers?

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[Zed Head]

The tings you're calling spacers, are clamps.  They clamp the manifolds to the head.  That was my point.  Nissan calls them yokes because they hold a part in place.  They don't provide a space, separate two parts, like a spacer would.

Not trying to be difficult, just trying to help you get your head around what those little parts do and how important they are.  They're very important.

[Zed Head]

A followup - Nissan has had trouble getting their exhaust manifolds clamped in place, without breaking studs or leaking, for many many years.  Take care in choosing your parts.