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Thread: Replacing a Previa head gasket.

  1. #41
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    Re: Replacing a Previa head gasket.

    Although I want to minimize the work on this job, I decided I better at least replace the valve seals since I have the head off and there are so many miles on the engine. I'm glad I decided to do this as the valves for the cylinder that took the most water were pretty well stuck in the valve guides. I got them freed up. I still have a few valve seals to change. Makes me miss 2 valve per cylinder engines. I did not lap the valves as I don't want to deal with changing shims.

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    Finished replacing the valve seals.
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    Last edited by tfreed1; 09-07-2019 at 07:06 PM.

  2. #42
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    Re: Replacing a Previa head gasket.

    Cleaned up the block deck and it is in good shape other then the pitted area.
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    After reading about possible options, I decided to use a small bit of JB Weld epoxy in the pitted area.It takes at least 15 hours to cure. I will file it flat before putting the gasket and head on.
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    Here is a SAAB TSB using this solution:
    210_1797.PDF
    Last edited by tfreed1; 09-07-2019 at 10:43 PM.

  3. #43
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    Re: Replacing a Previa head gasket.

    I put on the gasket....
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    Torqued the head bolts....
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    And installed cams.
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    Will work on connecting all the peripherals and getting the job finished as time permits.

  4. #44
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    Re: Replacing a Previa head gasket.

    Quote Originally Posted by tfreed1 View Post
    Here is a SAAB TSB using this solution:
    210_1797.PDF
    Well that certainly makes me feel better about it. If I ever run into that situation I'll likely give it a try. Looking good! Thank you for the awesome documentation and please keep us posted on how things hold up . Tim

  5. #45
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    Re: Replacing a Previa head gasket.

    Thanks. The TSB made me feel better about it too.

    Some additional information that may be helpful:
    I drained the oil the day after the gasket blew and there was quite a bit of water in the oil pan. I drained the coolant and refilled the oil and cranked the fresh oil around the engine using the starter. I did not want to leave water in the oil passages for an extended period of time. When (fingers crossed) the engine starts, I plan on running it for a while and then changing the oil again. I plan on adding straight water first, then draining it before adding antifreeze.
    Last edited by tfreed1; 09-09-2019 at 05:33 AM.

  6. #46
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    Re: Replacing a Previa head gasket.

    I finished getting everything together and the engine is running well after a few minutes of smoke from the antifreeze in the exhaust and the oil I used while assembling the head. I ran the engine for about an hour to check for leaks and to boil off the remaining water from the inside of the engine. When it cools, I am going to change the oil, drain the water, and add antifreeze.

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    I would estimate I've spent 35 hours of actual work time on this job. I spent time getting 26 year old bolts loosened and figuring out what needed to be taken out. I changed the front O2 sensor and had to drill out the studs that were too rusted to get out. I spent a lot of additional time researching how to deal with the head pitting.

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    Leaving the engine in the van made the job possible to do on my own. I would not want to pull the engine without help. I also did not need anything other than a floor jack and jack stands to raise the van or the engine.

    While under the van, I found these supports rusted on both sides and will repair them.

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    I plan on using the van to commute to work and will let you know how it is doing.
    Last edited by tfreed1; 09-14-2019 at 01:16 PM.

  7. #47
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    Re: Replacing a Previa head gasket.

    Awesome! Thanks for taking the time to document!

  8. #48
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    Re: Replacing a Previa head gasket.

    I hope no news is good news.

  9. #49
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    Re: Replacing a Previa head gasket.

    I have driven the Previa about 1200 miles since replacing the head gasket and it is running fine. It seems to have a bit more power than before and the gas mileage has increased a bit as well. It has not lost any coolant or oil since the gasket repair. I am going to take it on a trip for the holidays (about 1800 miles round trip) and will give an update after that.

    I replaced the third member with one from a 96 SC last spring and the rear end ratio is 3.73 rather than 4.30 which makes highway driving a bit quieter. I want to see if my highway gas mileage is any better when we go on the road trip. The acceleration is acceptable.

  10. #50
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    Re: Replacing a Previa head gasket.

    Drove the van on a trip about 1800 miles of highway driving and it is still running well. Have about 4000 miles with the new head gasket. Van has lost no oil or water.

  11. #51
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    Re: Replacing a Previa head gasket.

    Hi Tim and everyone on this thread. Which is excellent. Iím getting geared up to run this gauntlet and Iíve noticed that since the first time i looked, the photos from the original repost have disappeared. Are they still available anywhere?

    Thanks

    Ethan

  12. #52
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    Re: Replacing a Previa head gasket.

    Welcome to the forum Ethan.
    The most current explanation starts on page 2 of this thread.

  13. #53
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    Re: Replacing a Previa head gasket.

    Quote Originally Posted by peaquod View Post
    Hi Tim and everyone on this thread. Which is excellent. Iím getting geared up to run this gauntlet and Iíve noticed that since the first time i looked, the photos from the original repost have disappeared. Are they still available anywhere?

    Thanks

    Ethan
    Hi Ethan,

    The latest news on getting the photos back is here:
    https://www.toyotavantech.com/forum/...ome-TVT-images

    It looks like they will eventually be view-able again.


    if you have any questions about the head gasket replacement, ask them here and someone should be able to help. Good luck.

    Tony

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