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Old 07-07-2021, 10:08 PM #31
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Quote:
Originally Posted by gamefreakgc View Post
Last year I rebuilt an engine that had been ruined by Blue Devil stop leak. The owner had a head gasket leak in cylinders 5 and 6 so put a bottle in. The product will harden anywhere it comes in contact with air. Problem was, there was air bubbles trapped in the coolant system. Some of it made it into the combustion chamber like it was supposed to and created a quarter size welt inside the chamber. Not so good for the spark plug or the cylinder head. The rest solidified in the cylinder heat passageways completely blocking the coolant passages on the passenger's side head, and in the radiator clogging it up so it couldn't cool off. So it went from just a head gasket leak to severe overheating issues and needed new hoses and radiator.



Long story short, don't use it. Fix the problem.
Great explanation gamefreak if it's used in an engine, the engine is either parts or a major rebuld to clean it out. I would suspect deposits in the radiator cooling tubes as well...



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Old 07-08-2021, 12:07 PM #32
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Quote:
Originally Posted by brillo_76 View Post
I know my one 4 runner has a bad head gasket. It smokes white smoke that lingers like fog when I fire it up. Its poor engine was really beat and I plan to swap its engine and transmission when I fix it.

The white smoke is like a fog machine on that one. I suspect warped heads on my issue.

On mine that smoke never stops.

So some good test especially a leak down test should help you find the location of the leak.

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Same here - I have a small leak and I talked myself up from doing the gasket alone to "why not do heads" to "why not replace motor" to "why not do transmission too" haha. Oh well, buying myself another 20+ years with it if I'm lucky.
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Old 07-08-2021, 04:43 PM #33
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Originally Posted by Devbot View Post
What about/why not stuff like Blue Devil?

Like the others stated snake oil.. Not only will not not work a pile of times. It makes you one heck of a mess ...:-(


I think my bad head gasket engine had the old Blue Devil treatment too it..
Down the road i will pull it apart to see what it looks like.. ;-)

Its low in the priority list at the moment. :-)
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7 3rd gens listed in the build thread (2 are parts mobiles)
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Old 07-09-2021, 06:33 PM #34
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Here are cold compression numbers




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Old 07-09-2021, 07:15 PM #35
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Updated to hot. Can any 3rd gen experts help interpret the numbers? The cold numbers are all over the place but the hot numbers are pretty consistent.

Another issue that I wasn’t expecting, the intake hose was FULL of oil it was spilling out as I removed it.







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Old 07-09-2021, 08:29 PM #36
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Are you sure your compression tester works properly?
Is it the screw in type?

Should be tested with the motor warm, all plugs removed, the throttle wide open and a fully charged battery.

Crank it and count to 6 for each test.
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Old 07-09-2021, 08:39 PM #37
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This is a bad headgasket right?

Quote:
Originally Posted by alumarine View Post
Are you sure your compression tester works properly?
Is it the screw in type?

Should be tested with the motor warm, all plugs removed, the throttle wide open and a fully charged battery.

Crank it and count to 6 for each test.

Yes, screw in type, and the tester hasn’t given us any issues before. And that is how we tested it, first we did it cold, WOT, no plugs, but we cranked the engine until the tester stopped rising, probably about 5-6 seconds. Then we repeated the test, same procedure with the engine warm after running for 10 min.

The exhaust smells really rich, I didn’t notice this before but after idling it indoors it’s pretty smelly.


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Old 07-09-2021, 09:04 PM #38
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Might be time for a valve adjustment job. If that doesn't fix it, it might be a head gasket which is the worst that can happen. I have seen some instances where a valve job fixes bad or low compression.

Thing that sucks about a valve job is that Toyota's use shims instead of the classic crack the nut loose and screw in/out the tappet screw.
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Old 07-09-2021, 09:45 PM #39
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Quote:
Originally Posted by FD7683 View Post
Might be time for a valve adjustment job. If that doesn't fix it, it might be a head gasket which is the worst that can happen. I have seen some instances where a valve job fixes bad or low compression.



Thing that sucks about a valve job is that Toyota's use shims instead of the classic crack the nut loose and screw in/out the tappet screw.
Yup the nut and screw went away in the late 80's. Older 22R engines had that for valve adjustment. Gosh I wish they stuck with it as that was my favorite way to adjust too..

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Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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Old 07-09-2021, 09:53 PM #40
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Another concern is where this oil is coming from in your intake. Your PCV valve not gummed up and working properly? As if it stuck open I am wondering if your sucking some oil into it via that hose.

How does your throttle body butterfly look? Really carboned up and nasty? I am thinking that pcv valve hose hooks into near or right after the throttle body.

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7 3rd gens listed in the build thread (2 are parts mobiles)
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Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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Old 07-09-2021, 11:59 PM #41
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Quote:
Originally Posted by brillo_76 View Post
Another concern is where this oil is coming from in your intake. Your PCV valve not gummed up and working properly? As if it stuck open I am wondering if your sucking some oil into it via that hose.

How does your throttle body butterfly look? Really carboned up and nasty? I am thinking that pcv valve hose hooks into near or right after the throttle body.

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I’m almost positive it’s related to a busted PCV, see it when BMW’s all the time. Plus cracked vacuum hoses, it’s like I never left!

TB is dirty and I can see oily residue in the intake manifold


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Old 07-10-2021, 08:29 PM #42
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I’m almost positive it’s related to a busted PCV, see it when BMW’s all the time. Plus cracked vacuum hoses, it’s like I never left!

TB is dirty and I can see oily residue in the intake manifold


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That would be my guess on the PCV valve and why your throttle body is all oily and why the oil came out of your air intake hose. :-)
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Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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