Triumph 2000/2500/2.5Pi Rocker Shaft and Fittings, Pushrods and Followers

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Part No.: GRID008643

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Rocker shafts are tubular in construction.
The ends of the shaft must be plugged to form an oil gallery inside the shaft.
Oil is fed via the rear rocker pedestal into the shaft.
Drillings in the shaft allow lubrication of the rockers.
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214559
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Tuftride hardened 6 cylinder Triumph Rocker Shaft fitted with end plugs.
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214559UR
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Complete, ready to fit, all models.
This assembly is built with reconditioned rocker arms and pedestals.
All other components used are new.
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214559RASSY
No longer available
Anyone rebuilding a rocker shaft assembly for a TR250, 5, 6, Spitfire MK IV/1500, or Midget 1500 will have to deal with rocker arm to shaft clearance. The stock rocker arms were never bushed, and the tolerances specified are based to the cast iron on steel interface. The TR6 and Midget 1500 workshop manuals give the shaft diameter as 0.5607” to 0.5612", and the rocker arm bore is given as 0.563” to 0.564". This translates to a clearance of 0.0028” to 0.0033". If your rockers are worn, they must be replaced. If the bore diameter in the new rocker is on the high side, and your new rocker shaft is on the small side of the range, the clearance will approach the maximum allowed. In addition, the stock un-bushed rocker arms wear more quickly than rocker arms fitted with bushings. This will in time reduce your oil pressure.

Our supplier decided to address these issues by arranging for special rocker arms to be made. These are identical to the OE rocker in shape, but are fitted with a bronze rocker arm bushing. The challenge was figuring out how to deliver bushed rocker arms that would have the proper clearance when fitted to a new rocker shaft. We know that the optimum clearance between the bushing and the shaft is generally given as 0.002” to 0.003”. Rocker shafts are made to a standard dimension, with some tolerance. That means the actual diameter of the shaft will vary a little bit. If we honed these rocker arms to fit a “standard” rocker shaft perfectly, they really would not be perfect when they were installed. The actual clearance would vary from shaft to shaft. That would be OK, but that was not what we were trying to achieve. We supply these rockers with the bushing un-honed, meaning they will not fit any rocker shaft. You will need to have the bushings homed to fit a specific rocker shaft. Tell your machinist you want a finished clearance of 2 thousandths (0.002”).

The advantages are numerous. The rocker arms and the rocker shaft will last longer. You will not lose as much oil pressure as you would with the stock un-bushed rocker arms. The other critical area for wear is the tip which comes in contact with the valve stem. The tips are very hard, 50-52HRC (Rockwell C scale), which is the same as new unused rocker arms.
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109023UR
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£15.50 ex VAT£18.60 inc UK VAT
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Anyone rebuilding a rocker shaft assembly for a TR250, 5, 6, Spitfire MK IV/1500, or Midget 1500 will have to deal with rocker arm to shaft clearance. The stock rocker arms were never bushed, and the tolerances specified are based to the cast iron on steel interface. The TR6 and Midget 1500 workshop manuals give the shaft diameter as 0.5607” to 0.5612", and the rocker arm bore is given as 0.563” to 0.564". This translates to a clearance of 0.0028” to 0.0033". If your rockers are worn, they must be replaced. If the bore diameter in the new rocker is on the high side, and your new rocker shaft is on the small side of the range, the clearance will approach the maximum allowed. In addition, the stock un-bushed rocker arms wear more quickly than rocker arms fitted with bushings. This will in time reduce your oil pressure.

Our supplier decided to address these issues by arranging for special rocker arms to be made. These are identical to the OE rocker in shape, but are fitted with a bronze rocker arm bushing. The challenge was figuring out how to deliver bushed rocker arms that would have the proper clearance when fitted to a new rocker shaft. We know that the optimum clearance between the bushing and the shaft is generally given as 0.002” to 0.003”. Rocker shafts are made to a standard dimension, with some tolerance. That means the actual diameter of the shaft will vary a little bit. If we honed these rocker arms to fit a “standard” rocker shaft perfectly, they really would not be perfect when they were installed. The actual clearance would vary from shaft to shaft. That would be OK, but that was not what we were trying to achieve. We supply these rockers with the bushing un-honed, meaning they will not fit any rocker shaft. You will need to have the bushings homed to fit a specific rocker shaft. Tell your machinist you want a finished clearance of 2 thousandths (0.002”).

The advantages are numerous. The rocker arms and the rocker shaft will last longer. You will not lose as much oil pressure as you would with the stock un-bushed rocker arms. The other critical area for wear is the tip which comes in contact with the valve stem. The tips are very hard, 50-52HRC (Rockwell C scale), which is the same as new unused rocker arms.
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109024UR
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Screws into drilled rocker pedestal.
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500469
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Replaces springs on rocker shaft to remove the side tension and allow the rocker arms to rotate easier, whilst also keeping the rocker arms more centrally in position.
Qty Req-1, Item Info 2-rocker shaft - locates between rocker arms
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These lightweigt tubular push rods are stronger than the originals and are suitable for high compression heads.
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149513UR
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148916
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These lightweight tubular push rods are stronger than the originals and are manufactured slightly shorter to make them suitable for high compression heads.
Qty Req-12, Model-2500S & 2500TC
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148916UR
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It is vital that a camshaft & its followers are properly lubricated when installed and run in an engine for the first time.

Use ‘Cam Lube’ (RX1358).

This is the smaller diameter follower at .687" OD.
Qty Req-12, Model-2000 Mk1
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144343
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It is vital that a camshaft & its followers are properly lubricated when installed
and run in an engine for the first time.
Use ‘Cam Lube’ (RX1358)

This is the larger diameter follower at 800" OD.
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143552
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14355212K
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These Tappet/Cam Followers are Tuftride Hardened and have an oil drain hole in the side.

It is vital that a camshaft & its followers are properly lubricated when installed and run in an engine for the first time.
Use ‘Cam Lube’ (RX1358).
Qty Req-12
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143552UR
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£6.50 ex VAT£7.80 inc UK VAT
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These Tappet/Cam Followers are Tuftride Hardened and have an oil drain hole in the side.

It is vital that a camshaft & its followers are properly lubricated when installed and run in an engine for the first time.
Use "Cam Lube" (RX1358).
Qty Req-1
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14355212URK
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12 month warranty
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Product Description

Triumph 2000/2500/2.5Pi Rocker Shaft and Fittings, Pushrods and Followers