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>>Head gasket change, do I "have to" get the head shaved???<< 200 90

Hi.

I will be changing the head gasket on my 244. (b230, 210k miles, m47, timing belt changed 15k miles back)

In order to save time and money, I'd like to know if shaving the head is absolutly necessary. Could the gasket show a sign of failure that would indicate that the head has'nt warped???

Also, I have a set of gaskets including the obvious to change, such as:

-Exhaust manifold gasket

-Intake gasket

-Valve cover gasket

There are 18 or so gaskets left in the kit, having the top off the engine should I start changing all the seals and gaskets I can get to???

Thank you bricksters!









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    Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

    Wether you get the head shaved or not should be based on teh condition of teh head.

    Disregard the head gasket if it doesn't look bad, because even a small passage broken in teh gasket that you can barely notice is not good.

    Check for distortion, you probably don't want anything as high as 0.004 inches of distortion, and no warpage.








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    Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

    Let me know how it turns out. I too have 740, case of overheating, same thing with oil coating in resvoir. I was planning to do it this summer.








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    Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

    Just get it surfaced, trust me. It only cost me $50. The project is big enough that you'll want it to be right the first time (I did this whole project on my '84 a little while back). As someone else mentioned, it comes back really clean too, which is nice. The machine shop should also be able to tell how well the valves are seating. As for the extra seals, I bought the kit and have a bunch left over too. There are 8 small rubber pieces with an undercut on the side and an conical flange on one end. These snap onto the top of the valve stem and act as a cushion between the valve stem and underside of the barrel. There are 4 similar sized round ones which I think have a metal clip around them too. These are the oil seals for the intake valves (none on the exhaust valves). These both require taking off the cam and barrels, and the oil seals require removing the valve springs as well. If you do this, you might as well lap the valves (cheap and easy to do yourself, something I missed which I now regret a lot) to make sure they seat properly. There is a gasket that goes between the exhaust manifold and down pipe. There are injector seals. There's at least one water pump seal too, where it meets the head. If its old, the water pump is something else you should think about doing while you're in there , being a lot easier to do with everthing out of the way. As for the other stuff in the kit, I haven't figured it all out yet either. Another thing to think about is the breather system, which on my '84 is next to impossible to do with the intake manifold in the way. I would replace all the breather system hoses, flame trap, and maybe the box too. With the exception of the breather box, all the other stuff is available at IPD for a reasonable cost. If you decide to pull out the valves, I figured out a cheap/tricky way to do it with common shop tools. There were a couple tricks I figured out in a few other places too.

    Let me know how far you want to go. I'd be glad to share what I learned.








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      Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

      Thanks Ben.

      Let you know when I get my hands dirty. Should be next tuesday.








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    Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

    Warpage can be checked with a staight edge and feeler,maximum allowed is in Haynes. If engine overheated I would get it pressure tested or mgna fluxed for a crack at a machine shop. Curious why you are changing it.








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      Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

      I get oil in the coolant overflow tank. Manual tranny so not auto. trans. fluid. I asked around and all suggest faulty head gasket. Would you agree?








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        Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

        Yes I agree it could be head gasket but more likely the head is cracked. There is only one passageway to the head through the gasket for oil under pressure and of course a return path for the oil to drain back. If the gasket is blown through at this point to a nearby water passageway in the gasket then oil in coolant and possibly colant in the oil would result. But it is also very likely that the head has cracked and oil is flowing into the water jacket internally. I am not trying to be pessimistic but that was my experience. I was able to purchase a used head from a Volvo shop.

        The cause of my problem was a bad overheat episode. Had low compression on 1 and 2 and could see damage to the gasket between these cylinders upon disassembly and some warpage. There was no apparent degradation of the gasket at any other point. I had oil in coolant so therefore my assumption was cracked head. BTW the block rarely rarely will ever crack.

        As I said you can get the head checked at a machine shop. I opted to just buy one because i trust the owner of the Volvo shop when he said it was good and the price was right, around $150 I think. I checked the valve clearance on the head to be OK, installed new cushers under the buckets, put in a new front cam seal installed it and it ran like a charm.

        Good Luck








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    Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

    what you're wanting to do and what you will get can/will be two TOTALLY different things. YOU NEED to get the head to a machine shop (many parts stores have the tools. NAPA usually does or can refer you to a good shop) so that it can be determined if the head is usuable or not. if you don't, all you run the risk of all the time, money and effort being in vain. if the head turns out to be ok, have it surfaced and COMPLETELY cleaned. surfacing it will remove the slightest amount of metal, just enough to give a good sealing surface. it will/should come back to you looking new and shiny. i'm sure that there could be some scientific mannor that can look at the gasket and tell you something, but any and all mechanics will tell you to take it to a shop.

    whenyou remove parts/pieces, pay attention and note if it has a gasket or seal. DON'T change it yet. change it once your re-installing it. that way you don't run te risk of damaging it and causing problems later.

    i recently did this repair on the wifes car (neon) and the heaqd took 1 day and 70$. turned out perfect (so far.)

    good luck.








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    Re: >>Head gasket change, do I "have to" get the head shaved???<< 200 90

    Shaving the head (removing metal) is done for two reasons - to increase the compression ratio and to re-create a flat sealing surface. I'll assume from the tone of the question you don't want the 1st. If you have overheated the engine or suffered a blown head gasket it is worth having the head checked by a machine shop to see if it is warped. If so, some shaving is in order. Otherwise, just clean well and use a new head gasket.

    John Mc.

    95 Jetta GLX

    71 1800e

    63 544 (2.2 liter bored out B20 - head gaskets are $100!)








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