Giorgio13

Should valve cover bolts be replaced.as well? Torque specs?

Thanks guys

oldskewel

iTrader: (1)

speaking only for my '91, but assuming other LS400's are the same ...

I did not replace the bolts. Lexus does not recommend replacing.

I did use new seal washers for the bolts. Little grommet things with a stamped steel washer thing bonded to the rubber. They came in the kit that had VCGs, spark plug tube seals, and these. 90210-07001, need 32. Way cheaper to get these all in a single kit.

Torque the VCG bolts down evenly and slowly to a final torque of 6.0 Nm = 53 in-lb

That is a really light torque. What I did was to torque to that (carefully, evenly, etc.), and then wait an hour or so while doing other stuff, and then came back to hit them again to that. For purely metallic fastening, this would not matter much, but due to the rubber gasket and rubber washers, giving them some time to take their shape will affect torque.

I found my 10mm swivel socket to be very helpful in easily getting to some of the tougher bolts.

Here are some other part numbers I pulled from my notes when I found the one above:
11193-15010 8 spark plug tube gasket
11213-50020 2 valve cover gasket; also 11213-50021
12204-50010 1 valve s\a, ventilati (PCV valve assembly)
12204-50011 PCV valve
12261-50021 hose, ventilation, n (for PCV = goes into the PCV valve)
12262-50010 hose, ventilation, n (for PCV = fat one toward throttle body)
90210-07001 32 Valve Cover Washer

Giorgio13

Thank you sir...ill need to get a few more items like the hoses for the pcv.

oldskewel

iTrader: (1)

Some of those entries on the parts list may have come from dealer service receipts from the PO. So it does not mean I bought those parts exactly. It has been so long, that I don't remember. I have owned this '91 since 2007, and the original owner was my father in law. He did all dealer service up until the last couple of years, then switched to his local indy, then me, I do it all myself.

When I first got the car and stack of receipts, I went through it all and entered the date, mileage, etc. into an excel spreadsheet to track things. And I've maintained it as I've continued with repairs and maintenance. Useful for me in quickly accessing part numbers.

In general, for all the vacuum lines, my first attempt is to use line by-the-foot, cut to fit. And I'd recommend to start with that. It will be far more convenient and cheaper than getting the custom-shaped Lexus parts everywhere. You'll also be ready for any unexpected brittle hose failures as you take things apart.