Mr. Nimz valve cover gasket restoration

Discussion in 'V8 - Maintenance & Troubleshooting' started by 98SF19, Apr 15, 2018.

  1. 98SF19

    98SF19 AlphaKennyBuddy

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    As the gaskets are getting scarce, I wanted to make future searches easy for others. So I did a search on here and got 2 results. The first one was exactly what I needed (assuming Nick describes it right) - Paul's method of restoring the VC gaskets. I bought a set from him which have worked well since '12, but since I have motor open, I'm going to run this procedure on my original gaskets. I should thank luigisho too since he is the OP here . . .

    https://shoforum.com/index.php?threads/oil-on-1-spark-plug.90805/#post-927917

    Can someone clear up the "Rislone" step. I assume Nick's referring to their standard Engine Treatment product? I see they make a high-mileage version which I may use in the crankcase once things are back together.
     
    Last edited: Apr 15, 2018
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  2. gamefanatic

    gamefanatic SHO Member

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    Have you tried MG Chemicals Rubber Renue?

    I have also heard, but not tried 303 rubber seal protectant and conditioner.

    Not sure which Rislone product they were referring too. Since they are generic cleaners not directly related to rubber restoration. I know that agents are added to high milage oils to help keep rubber parts swollen for better seals. Laquer thinner is not good on plastic, it breaks it down.
     
  3. 98SF19

    98SF19 AlphaKennyBuddy

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  4. 99sho-time

    99sho-time SHO Member

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    how come you cannot find new ones? sho source has them. If they are really bad id just rtv the head let it dry to give extra compression.
     
  5. 98SF19

    98SF19 AlphaKennyBuddy

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    2 reasons:
    Trying to save $$$, and
    Want to be prepared for the future when there are no longer any left.
     
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  6. gamefanatic

    gamefanatic SHO Member

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  7. 98SF19

    98SF19 AlphaKennyBuddy

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    This cat did some work, but woulda been nice if he included the Nimz Method.
    Go straight to 13:20 for summary.
     
  8. gamefanatic

    gamefanatic SHO Member

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    I have seen another video before that showed using ATF vs 303 with a heat gun to restore plastic parts. I have never attempted this, so I don't know what the long term effects are. They claimed the results to be the same and long term. And like with the wintergreen, the parts became noticably closer to the original black color.
     
  9. 98SF19

    98SF19 AlphaKennyBuddy

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    I guess the jury is still out re: long term consistency. I'd even thought maybe the weather stripping could be restored. but haven't done those before so don't know if there would be other obstacles.
     
  10. 98SF19

    98SF19 AlphaKennyBuddy

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    I did the gaskets in wintergreen oil & alcohol and . . . *oops* . . . one of the VC gaskets broke when I was taking it out. :( I let them soak for at least a week in a shallow aluminum foil baking pan with a 12"x8"+/- glassware dish over the top to keep them submerged. Turned over midway through and they were fine then. I don't think they were inordinately soft when I took them out, I just wasn't as careful as I should have been.
    No worries though. Even though I have the replacement set I installed back in 2012 still intact, I decided to install the broken original one into VC, using rtv to seal the joint as well as a thin coating on the sealing surface, and of course, I'll add some more rtv to the corresponding part of the head as well as either side of the water pump drive cam bearing and the timing cover seals on other side, reinstalling covers before full cure.
     
  11. 98SF19

    98SF19 AlphaKennyBuddy

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    Got dirty girl back together and started up fine. Still running a smidge rough, and there doesn't seem to be anymore misses, but there is still a HUGE loss of power at WOT, and this is with secondary butterflies removed, plates, shafts and all, and 8 new coils, 8 new plugs. No codes (yet). Going to get fuel pressure checked out this week, hopefully . . .

    Had a scare today though . . . dropped son off at barber, and as I was heading through open parking lot, I popped it a bit. Well, she sounded great, but taking my foot off the gas didn't affect throttle position at all. :eeeeeek: For a brief moment, there was sheer panic, especially since standing on the brakes had almost no effect. If there had been a car at the end of the row . . .

    Is there anything other than a sticking TPS that would cause this? What's especially worrisome is that the brakes were so ineffective. Could a bad loss of vacuum be a culprit? 90% of hoses in motor bay are original. When on open road, I got rpms to upper range and blipped it a few times - condition did not return (but damn did it sound great!).
     
  12. SHOdded

    SHOdded SHO Member

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    cruise control switch perhaps? was a problem in gen 2, at least.
     
  13. 98SF19

    98SF19 AlphaKennyBuddy

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    My CC has been disabled for a while now since I have LEDs in the high center brake light (I'm in the process of adding a ton of higher-draw LED strips to try and counter this, but haven't hit the threshold . . . yet).
     
  14. stephen newberg

    stephen newberg Moderator Staff Member

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    TPS is very likely the problem.

    pax, smn
     
  15. gamefanatic

    gamefanatic SHO Member

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    IAC sticking can also cause the issues. Had that a lot on my Cadillac.
     
  16. stephen newberg

    stephen newberg Moderator Staff Member

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    Actually, on this car the IAC is more likely to cause hard starting or inability to stay at idle leading to shutdown.

    pax, smn
     
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  17. 98SF19

    98SF19 AlphaKennyBuddy

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    Now that starter is back to *normal*, I notice that I'm still getting the sticking throttle for a split second after letting off the gas (referencing middle paragraph of post #11 above). It happens about once out of every 3 or 4 times I do it. I had a thought that maybe this is due to badly constricted exhaust/cats. Could this be a possibility? Exhaust stinks a bit after a minute of running, and I think after 20 years the cats are not doing their job and are likely broken up badly. I just haven't read about constricted exhaust causing this, so not sure if it's plausible.
     
  18. 99sho-time

    99sho-time SHO Member

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    did you adjust your throttle stop some the butterly can get stuck in the groove thats been made over the years if maladjusted.? Id try and determine whether your throttle sticking is a mechanical issue or a symptom of something else. the cats on these cars when I dropped mine they seemed to be in great shape. The factory y-pipe is actually amazing quality. restricted exhaust gonna make the engine ping. tps isn't gonna cause the throttle or pedal to feel as if its physically stuck. sounds like a mechinal type of stuck to me.
     
  19. 98SF19

    98SF19 AlphaKennyBuddy

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    I cleaned TB up a bit recently so I guess no to the first question. I believe the pedal DOES stick (IE doesn't rebound) when I remove my foot, so you might be right - hadn't considered it from that perspective. I replaced TPS a year or so ago but don't remember if the pedal and TPS are matched in positive and negative tension. I can have my son blip the throttle while I watch it.

    I've heard mixed reviews on this, as well as mixed reviews of the Magnaflow replacement, mostly fitment issues.
     
  20. 99sho-time

    99sho-time SHO Member

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    Unplugging the tps will give the sensation of sticking throttle but not overcome standing on the brakes. Sounds like you have something going in your throttle linkage. Move the throttle plate by hand
     

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