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Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 04-11-2006, 09:51 AM   #21
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You said 9 pounds. I assume you weren't talking about the SC.

There'* alot of confusion here. About whether the 0-rings were there, what you torqued what to....

So what did you torque to 9lbs?
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Old 04-11-2006, 10:26 AM   #22
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Try something:

1. Remove your thermostat, put the outlet back without it.
2. Tape off some plastic on the LIM, leaving the coolant inlet and outlet for the sc exposed (keep the coolant from getting into the LIM).
3. Crank the engine. Does coolant only come out of ONE of the holes, or both?

We need to verify the intended coolant path of the LN3 vs L67 heads. If you are getting two pressure feeds to the SC rather than a supply and return, this could be a problem. Can you verify the coolant ports at the same time on the LN3 intake manifold? Do they feed front to rear? Or left to right within each head?
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Old 04-11-2006, 11:17 AM   #23
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That makes a lot of sense. I'll look into that and also check my coolant line connections. Would be very possible for them to leak if both of them have pressure (instead of one being a return).

Sorry for the confusion. The bolts holding the intake manifold to the heads are at 8 ft/lbs. The bolts holding the */C to the manifold are about 20 ft/lbs.
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Old 04-11-2006, 02:18 PM   #24
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Wren thought you meant 8lbs..but that looks to be the lower intake to head torque you used. (I thought that spec was closer to 13lbs myself)
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Old 04-11-2006, 07:11 PM   #25
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I removed the */C again today. Both the gasket and O rings seemed to be dry. Lots of coolant down in the intake manifold. Hmmmm...

You guys suggested today that my throttle body to */C gasket was leaking, for this is where the throttle body gets its coolant to be heated (you know, people spend hundreds of dollars on cold air intake kits...). So, I removed the throttle body. Can't tell by the gasket if its leaked here, but I was missing one out of three bolts (yes, my fault, not good) and there was coolant in the throttle body and even in the air filter.

The important part: when I first got this stuff together and started up, there didn't seem to be a coolant issue. Recall that my leak problem began when I was waiting for Ryan'* 2nd and 3rd ECM programs. And recall my WOT tests...the throttle body gasket was sealing fine, but due to the missing bolt and my lack of measuring the torque on the bolts (I never knew there was coolant running through it) it eventually broke loose. At around the same time, more or less, the head gasket went bad. The throttle body got worse, letting more coolant into the intake. Boost from the */C got it to leak from the area under the throttle body, I'm assuming because this is the path of least resistance for it to leak out of. Coolant doesn't belong there at any rate.

I checked the oil today and found it to be watery and maybe half a quart high. Dumped it and the filter and found quite a bit of water. All I can say is that it'* good that I haven't actually been running/driving it.

Enough coolant where it shouldn't be to make a grown man cry.

What'* next? Should I do a compression test? Would have to either borrow a gauge (or the air compressor tool) or buy one. Should I go ahead and order and replace the head gasket? I obviously need the missing bolt and a new gasket for the throttle body. Since I'm going to have the heads off, should I look into using an L67 head gasket? Should I use the L67 heads?

What a mess! Thank you
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Old 04-11-2006, 07:48 PM   #26
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L67 heads are far more efficient. You'll need the valvetrain for the roller rockers. The rockers will not mate to your LN3 pedestals.

Pull your oil pan and get the rest of the water out of the pan and inspect your crank and rod bearings for rust. If you pull rod caps, KEEP THEM IN ORDER.

Compression isn't the negative effect of that water. Bearing rust is.

Sounds like we got 'er licked though. Use L67 gaskets if you use LN3 or L67 heads (assuming they mate correctly) as the L67 gaskets are designed to handle the increased effective compression. Do not re-use old bolts. The head bolts are torque-to-yield, and stretch when torqued. One time use only.
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Old 04-11-2006, 08:20 PM   #27
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I think I'll skip swapping the heads for now, but I will getting a set of L67 head gaskets along with new bolts.

Sorry to break it, but you're speaking with an 18 y/o. With the heads, what'* the proper technique to torquing? The */C? I know that head gaskets can be fussy with torque.

A few people have been pretty negative on my idea of making a hybrid LN3/L67 and think I should have swapped the entire engine, but we're pretty darn close to getting this to work. Don't see why it won't. If I could have gone back to the beginning I would have done that, but this should work out.

Thank you for the assistance
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Old 04-11-2006, 09:55 PM   #28
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I didn't post the head torque sequence on purpose. If you get in that deep, you should have Chilton'* #28200 as a minimum. Prefer Factory Service Manuals. Chiltons will do fine, and should be under $20. You won't regret it.

Sure, I could TELL you the sequence and specs, but I'd rather you have the book at this point. You should.

Your age has nothing to do with the respect or treatment you recieve on this Forum. This is the one place you can go and find very little discrimination. You love Bonnevilles, so we sorta like you sometimes.
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Old 04-11-2006, 10:05 PM   #29
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Well...

I have an '89 FSM. Wouldn't think the sequence would ever change, so I'll refer to the guide you posted for the exact torquing.

BTW, with the */C off, I used the air compressor and blew the coolant out of the intake manifold and the injector ports. I removed the spark plugs and blew into there as well, but didn't get any out (I'm assuming any that made it there was burned).

Thank you. I'll look into the leakdown test hardware tomorrow.

But yeah, I've always thought modern Bonnevilles were pretty sweet. I've got a thing for those rare AWD 6000s too. An L67 would make that a killer car, if it coudl ever be done while retaining AWD
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Old 04-11-2006, 10:21 PM   #30
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Please check the head flow direction to the LIM still. That'* a spooky thought.
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