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valve job with head gasget replacement?? 700

posted by  haye on  Mon Jan 24 18:07 CST 2005
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Greetings,

I was told by a mechanic that to do a valve job on any head will very likely result in ring failure and smoking in short order. He advises against doing a valve job along with the head gasget for this reason. My Brick is an 8 valve B230 non turbo with 134K and was not well maintained before I got it. It is now spotless under the hood with most everything replaced with quality parts.

I am considering buing a rebuild head that has already had a valve job done, been pressure tested, and machined mating surface for about $250

Are all the B230 heads the same for the 8 valve motors?
Is 5-6 hours realistic for this job for a first timer with a good array of air tools?

thanks








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    valve job with head gasget replacement?? 700

    posted by  Big Harry on  Tue Jan 25 10:54 CST 2005
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    last visit: Sun Sep 21 11:06 CST 2014
    [RELATED]

    In the days of soft rings and engines that wouldn't run over 65,000 miles that was an accepted practice, so he probably has been misinformed by his Grandpa. Putting on a new head should only improve the performance.

    Regards,








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      valve job with head gasget replacement?? 700

      posted by  NJC on  Tue Jan 25 16:50 CST 2005
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      last visit: Sun Jul 24 13:42 CST 2011
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      I grew up with the understanding that 100,000 miles was a good life for a vehicle...this is from my Dad who driving around in the 50's as a teen.

      As soon as I started to drive Japanese cars I realized the standard had been raised. And so it goes with Sweden as well..
      --
      Norm Cook Vancouver BC; 1989 745T 204,000KM








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    valve job with head gasget replacement?? 700

    uid 55's pic
    posted by  john sargent on  Tue Jan 25 02:44 CST 2005
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    last visit: Wed Oct 22 09:07 CST 2014
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    I doubt that your car needs a valve job. A valve job, good or bad, will have no effect on the pistons and rings in your car. Find another mechanic, this guy is full if it.
    --
    john








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    valve job with head gasget replacement?? 700

    posted by  Steve on  Tue Jan 25 01:43 CST 2005
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    last visit: Fri Oct 24 07:16 CST 2014
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    Your mechanic is an idiot and you need a new one in short order.

    A "valve job" consists of re-seating the valve faces and seats so that they seal against combution pressures, making sure that stem and guide wear is not out of limits, and installing new valve stem oil seals. At 134k, I am not really sure you need a valve job, but it can't hurt to have the machine shop do a slight lapping of the faces and install new seals. Almost certainly your stems and guides are in good shape. While you are at it, install new valve tappet "husher" pads that reduce valve noise before you reinstall the head: this requires removing the cam.

    See the 700/900 FAQ under "features" button above for many more details on all of the above.








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      valve job with head gasget replacement?? 700

      posted by  illbird68 on  Tue Jan 25 09:17 CST 2005
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      last visit: Fri Jul 25 12:56 CST 2008
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      your mechanic is full of crap. i did a valve job and head gasket on my car at 330,000 miles over the summer....no issues yet. he is thinking that the increased holding power of the valves will force blow-by of the pistons. this is gonna occure to a limited extent in any car with these kinds of miles. i would say that a valve job is unnecessary now, but is not a bad idea anyway. do the valve job...replace the seals (USE VOLVO and not immitation seals) and the guides and put a good graphite head gasket on and plan on never fooling with the top end untill you hit half a mill on the odometer. good luck








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    valve job with head gasget replacement?? 700

    posted by  rhaire on  Tue Jan 25 01:00 CST 2005
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    last visit: Mon Aug 4 10:16 CST 2014
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    Well, there appears to be a consensus. Why would you let a guy (I edited a stronger word out) like that work on your car, let alone bend your ear?








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      valve job with head gasget replacement?? 700

      posted by  ivan on  Wed Jan 26 00:28 CST 2005
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      last visit: Wed Aug 22 20:55 CST 2012
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      Yes, a consensus of shade tree mechanics.
      Unfortunetely, the "old" mechanic is dead right....







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        valve job with head gasget replacement?? 700

        posted by  rhaire on  Wed Jan 26 01:14 CST 2005
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        last visit: Mon Aug 4 10:16 CST 2014
        [RELATED]

        I don't recall seeing too many (any) oil burning Volvos on the road. Hondas, Toyotas, domestics all the time. Volvos no. I do not think rebuilding is too often necessary. But then again, I do not talk to any shop mechanics anymore, or pay to experience their successes and mistakes.








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          valve job with head gasget replacement?? 700

          posted by  ivan on  Wed Jan 26 03:37 CST 2005
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          last visit: Wed Aug 22 20:55 CST 2012
          [RELATED]

          I was referring to the issue at hand, not necessarily as
          it pertains to VOLVOs. To do the job right, one needs
          to rebuild the head, and put in at least a new set of piston rings.







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    valve job with head gasget replacement?? 700

    posted by  ivan on  Tue Jan 25 00:59 CST 2005
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    last visit: Wed Aug 22 20:55 CST 2012
    [RELATED]

    I assume we are talking about the original engine.
    If you rebuild the head, or get another one, and leave
    the rest of the engine the same, you will not accomplish
    much. Meaning, it's like taking a shower and putting the
    same underware on....

    Pistons and cylinders are worn out, and there is certain
    amount of blow-by. With rebuilt head, there will be a loss
    of balance, and blow-by will increase, resulting in smoking,
    and oil consumption.

    If the head gasket needs replacing, go ahead and do it.
    No need to rebuild the head.







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    valve job with head gasget replacement?? 700

    posted by  VolvoSteel on  Mon Jan 24 19:04 CST 2005
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    last visit: Sun Mar 23 21:28 CST 2014
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    I picked up a car with a blowen head once, i purchased a refurbed head threw it on and it has been running since, other then piston slap which is normall for an 87 turbo thats my only beef with the whole car, id say go for it unless there is something else to the story here








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    valve job with head gasget replacement?? 700

    posted by  Rludwick on  Mon Jan 24 19:03 CST 2005
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    last visit: Sat Aug 31 16:10 CST 2013
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    And I'm quite sure that Bubba taught him that when he went to mechanic'n skool around a 12 pack of bud in someones driveway.

    Old wive's tale.
    --
    -------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '82 Mercedes 300SD








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    not sure but 700

    posted by  someone claiming to be frankford on  Mon Jan 24 18:41 CST 2005 [RELATED]

    I would ask him why it would happen on a volvo but not a honda or a toyota? I have had to put new heads on those cars and never had a problem with the rings. Sounds like he might be smoking something of his own.







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