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All Posted by Justin VanAbrahams [Email]  (#32) [Profile/Gallery]
(more from Justin VanAbrahams) on Wed, 11 Jan 2012 13:47:17
In Reply to: And one more thing...it only smokes at idle., darcey, Wed, 11 Jan 2012 11:08:02 Members do not see ads below this line. - Help Keep This Site Online - Signup |
You do need to remove the AC idler pulley, or you cannot access the bolts on the underside of the head Townsend mentions. If you look at your new replacement head gasket, you'll see two bolts holes on the outside of the timing chain area (near the firewall). That will give you an idea of what you're looking for. They are facing upwards - the bolt heads towards the ground, the thread pointing up in the air. You cannot remove the head without removing them. Obviously, don't forget to reinstall them. I've seen that at least a few times.
A failed turbo is a great failure. They are cheap and plentiful these days, and a great opportunity for an upgrade. :) The turbo in my XR4Ti is slowly dying, and I can't wait until it does. :p Replacement on a c900 is a little frustrating due to having align a bunch of parts while you hold a heavy turbo in place, but it's not difficult and not really all that time consuming. Just be sure - again - you get a proper gasket set, etc. and replace them all. My SPG came to me with the oil feed line "sealed" to the turbo with RTV and no gasket. I would have lol'ed, but spraying oil all over the radiator in traffic actually isn't that funny.
A leakdown test can really help you isolate these problems because you can generally hear where the leak is coming from - if you hear it in the valve cover, it's probably valves. If you hear it in the dipstick, it's probably the bottom end. If you hear it outside the engine, it's probably the head gasket. Unfortunately, a head gasket failure into the timing chain galley could cause the symptoms you're seeing and might make it hard to evaluate a leakdown test since you'd probably hear the leak in the cylinder head no matter what. One downside of a timing chain, I suppose! You could address that by doing the test with the valve cover off, though - slightly more work, but a clear path to proper evaluation. ;)
Coolant in the head bolt holes with the head on is unusual, but could happen. As soon as tension is taken off the head gasket it could leak. If you pulled a single bolt and there was coolant, that might be cause for alarm, but if you've pulled them all and some time later see coolant, I wouldn't be shocked. You'll probably have a righteous mess with you fully pull the head and leftover coolant goes everywhere anyway. Be sure you clean it up promptly.
I usually unbolt the power steering pump entirely, just to get it out of the way when pulling the head. The head is HEAVY, not having to futz with the pump is a benefit. It's only a couple bolts, and there is no time better than when your car is headless to replace the mounting bushings.
Be sure you let your machine shop know about the stripped bolt in the head so they can helicoil it. You don't want to leave that unattended, and you can't functionally do that with the head installed. I'd clean the exhaust manifold stud holes too, replace the studs (and maybe nuts, definitely studs), and fully take care of that area. Broken exhaust manifold studs are an annoying problem to have.
posted by 12.195.130...
, Tue, 10 Jan 2012 14:47:47, Tue, 10 Jan 2012 15:42:40, Tue, 10 Jan 2012 18:44:14, Wed, 11 Jan 2012 13:47:17 <-- Viewing This Message
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