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Forums > > Tryng to get rear valve cover (plenum) off 2000 Maxima SE...
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Old 12-21-2011, 04:47 AM
spates88 spates88 is offline
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Default Tryng to get rear valve cover (plenum) off 2000 Maxima SE...

We want to replace the valve cover gaskets on our 2000 Maxima SE. Trying to get big black plenum covering the rear valve cover off, and we are running into problems.
We have unbolted most of the hoses and brackets so we can lift it clear when the time comes. We have removed 6 long bolts and 2 nuts securing the front part and indeed the front part now shifts slightly.
We have removed 3 x 12mm bolts from the back close to the firewall (only after some difficulty). Actually, we are confused about which bolts need to come off from the back -- feeling our way around, groping in the dark, there seems to be a group of 4 bolts on the passenger side (2 x 12mm above 2 x 10mm?) and 2 other 12mm bolts across the back.
We were hoping to get the plenum loose enough to lift gently and get more room (and be able to see what we're doing!!) to disconnect the hoses at the throttle body (IACV? EGR?).
There is an excellent write up on an Infiniti i30 -- but the component layout seems different on the Maxima. Can anyone provide advice on what we can best do next to get this darned plenum off (without resorting to a pry bar!!!!).

Thanks, Rob & Seth
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Old 12-22-2011, 02:48 PM
spates88 spates88 is offline
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OK -- So we can answer our own question. We found this link on the site:
Index of /FSMs/Nissan/Maxima/2000
An enormous help. On our 2000 model there were 2 pairs of pesky 12 mm bolts securing the plenum on brackets at the back. After a struggle we removed these, plus numerous 10mm bolts on top of the plenum, plus the front bolts and nuts (plus several vacuum and cooling hoses on the right and around the throttle body) and and we were able to wrestle it free. (When I come to rebuild this, I shall replace every snap-clamp with a decent screw clamp!!).
So now we have the engine top apart. Any comments or suggestions on IACV / EGR / Other maintenance / easy worthwhile replacements would be welcome -- Thanks,

Rob & Seth
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Old 12-23-2011, 02:33 AM
streamcast streamcast is offline
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make sure all the passages in the plenum are free of debris. And make sure you tighten any clamps below the plenum. Oh yeah did you have a knock sensor code maybe a good time to replace that as well while plenum make it alot easier to replace know.
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2000, cover, maxima, plenum, rear, tryng, valve

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