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Dave Miles
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| Joined: | Thu Jan 6th, 2005 |
| Location: | Michigan USA |
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Posted: Mon Jan 17th, 2005 11:25 am |
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| Just what does it mean, when the top lever is LEFT of center. Does the gun not lock up tight? Is the locking lug worn? Can this condition be repaired, or should one avoid a gun with the lever left of center?
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Bruce Day
PGCA Member
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Posted: Mon Jan 17th, 2005 02:17 pm |
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| It means the wear plate is worn. There is a wear plate that is pinned in to the lug. New wear plates are available and a gunsmith can install them. It is not a significant repair issue.
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Bruce Day
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Austin Hogan
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| Joined: | Sat Jan 15th, 2005 |
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Posted: Tue Jan 18th, 2005 01:52 am |
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As long as the gun locks up, does not wiggle when closed, and no day light is visible through the breech when it is locked up, it is a cosmetic issue. Try a little Hoppes, or Rem action cleaner on the underbite and locking key; follow up with a little grease. This may go away.
Best, Austin
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Bill Murphy
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| Joined: | Mon Jan 10th, 2005 |
| Location: | Maryland USA |
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Posted: Tue Jan 18th, 2005 01:59 pm |
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| Top levers to the left of center are usually not present in guns with the latest variation of replaceable bolt plates. Left of center usually occurs with guns with no bolt plate or the non tapered bolt plate and the gun is often still tight when slightly left of center. In these guns, if the bolt goes all the way into the slot, whether the gun is tight or not, the lever will be a bit left of center.
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Phil Murphy
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| Joined: | Tue Jan 11th, 2005 |
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Posted: Tue Jan 18th, 2005 02:11 pm |
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Dave,
A top lever that is left of center can be the result of a number of problems. Post 1905, Parker fitted there guns with a wear compensation block on the bite of the lump. Both the wear block and the bolt are made of hardend tool steel. Three different varieties were fitted. If your gun is post 1905, your problem could be a worn wear block. Galazons, and Chaddicks can supply them. The other problem that Parkers develop is a loose hinge. Also called "off face". This is due to wear on the bearing surface of the lump that engages the hinge pin. It is almost never due to wear of the hinge pin. As, the hinge pin bearing surface is huge and surrounded by a case hardend bearing. The cure for an off face gun is accomplished by inserting a dovetail in the bearing surface of the lump, and refitting the barrels to the action. When properly fitted, the gun will close up tightly, with no space between the standing breach and the barrels. However, a proper fit should allow for 2 thousanths space between the watertable and the barrel flats. This is referred to as spring space and is essential, if the gun is not to shoot loose, in short order. If your gun is off face speak with Hugh Lomas of H.G. Lomas Gunmakers, Elkhart Lake WI.
Phil Murphy
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Banned and happy to be rid of a sanctimonious bunch.
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Bruce Day
PGCA Member
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Posted: Tue Jan 18th, 2005 05:58 pm |
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Phil, thanks for the explanation. I learned something. I thought that for an action that was off face, you just put in an oversized hinge pin.
I've never seen a Parker that was off face but I assume its possible. At most I have seen them that needed new wear plates.
Bruce Day
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Austin Hogan
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Posted: Wed Jan 19th, 2005 12:42 am |
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I tried to send Hick a photo of a trout watercolor but it was too big; I 've compressed the photo of the Parker locking mechanism, and hope it fits the format.
The photo shows the Parker locking mechanism, as removed from a lifter gun. The lock is a piece of key stock, ground on one side to about a 30 degree angle. This locking block slides into a mating cut in the under bight of the barrel lump. A simple inclined plane, ie a tapered wedge , was used to slide the locking key out of the bight on the lifter guns, to allow opening the action; a small spring pushed the locking block into the cut to lock the gun for firing. The locking block and bight are identical on top action guns ,but the top lever actuated a cam that retracted the locking block to open the gun.
Because the angle of the locking block and cut are about 30 degrees, wear of one thousandth of an inch , totalled across top and bottom of the key and cut, allows the key to advance two thousandths of an inch deeper into the cut. The locking mechanism is self compensating; the key advances in the cut as it wears. The wear is not noticable in lifter guns, as one cannot detect a few thousandths difference when lifting the latch a quarter inch.
The top lever moves about one inch, to move the locking key back about one eighth of an inch on top action guns. This is an eight to one ratio; ten thousandths of total wear on the key and in the cut would change the engaging point of the lever by almost three thirty seconds of an inch (.080). Note, in the picture, that about one thirty second of an inch clearance remains at the end of the locking key in this well worn lifter gun.
A thirty second inch of initial locking key movement is equal to one fourth inch movement on a top lever. The self compensation of the Parker locking key will be effective until the top lever is one fourth inch left of center.
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GregSchroeder
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| Joined: | Mon Jan 3rd, 2005 |
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Posted: Wed Jan 19th, 2005 02:49 pm |
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