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re ringing Vanguard 18 hp engine

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dlt1945
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2018/12/08 12:56:49 (permalink)
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re ringing Vanguard 18 hp engine

Could some one please till me if the piston rings #843793 are of the chrome type, My machinist said that my 
piston rings are. I tried to get that information from the Briggs tech, And basically they don't know. also my rings have the letter T on the top of the rings and the new rings have the letter R on the top, They do seem to fit properly . Is a 240 grit ball hone a good choice to deglaze my cylinder walls?
                        thanks Dave T

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    AVB
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    Re: re ringing Vanguard 18 hp engine 2018/12/08 13:24:18 (permalink)
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    So far every Briggs engine that I have done with needing rings usually requires over sizing due to both tapering and ovaling so I would first make sure that your cylinder is true. Either a flex or ball hone will only these conditions worse.
     
    But as far as simple de-glaze yes either a flex or ball works. I just de-glazed a cylinder using a flex hone the other day that had pockets of none de-glazed areas which indicated unusual wear pattern.
     
    As for the rings there nothing in the parts manuals as what type of rings Briggs used. But make you are ordering the rings that is appropriate for your date code as Briggs do at times change pistons during production runs.
    Roy
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    Re: re ringing Vanguard 18 hp engine 2018/12/08 19:14:24 (permalink)
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    X2 In my opinion reringing by itself is akin to putting a bandaid on a chest wound. You may gain a bit of engine life and reduced oil consumption but hardly worth it for the amount of work involved.
    dlt1945
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    Re: re ringing Vanguard 18 hp engine 2018/12/09 11:58:30 (permalink)
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    AVB thanks for your quick reply. I need to tell you a little more about my Briggs Vanguard 18 hp.
    engine. I took the engine apart because there was only 120 lbs. compression in one cylinder. when I put oil into the cylinder the compression came up to 150 lbs. so thought there was something wrong with the piston rings. that was not the case ,the cylinder walls and the piston ring look very good. I had the bore checked by a machinist, And there is no excessive wear. So all I want to do is de-glaze the cylinder walls and install the new piston rings. I have the new rings and it looks like the top ring may be chrome and the 2nd. ring cast. I am not sure. So from what I explained to you would a 240 grit ball hone be the proper grit use?
                        thanks Dave T
     
    AVB
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    Re: re ringing Vanguard 18 hp engine 2018/12/09 14:20:08 (permalink)
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    Briggs is having me to do cast iron liners at 180 grit on resizing so 240 should be fine unless the engine is just plain aluminum bore then it is 280 grit. Personally I would still use my ridge hone as it will show hidden surface problems as there could be worn pocket areas or tapered more than measured as ridge hone will not follow the contours of the cylinder but instead tries to do a perfectly round non taper cylinder.
     
    Just wondering how you got such a high compression reading at starting non running speeds as the ACR should had it a lot less. I normally see around 70-90 psi on ACR engines.
     
    Any way the wet test did indicate a problem with the sealing.
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