Triumph Herald Rocker Shaft and Fittings

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Part No.: GRID005148

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144962
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£25.50 ex VAT£30.60 inc UK VAT
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1 Rocker Shaft Complete Assembly (Recon) - Part No. 144962R ASSY
Qty Req-1, Model-Herald 13/60
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144962RASSY
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£131.00 ex VAT£157.20 inc UK VAT
£50.00 ex VAT£60.00 inc UK VAT
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109023
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£9.65 ex VAT£11.58 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.
Qty Req-4
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109023UR
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£15.50 ex VAT£18.60 inc UK VAT
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109024
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£9.65 ex VAT£11.58 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.
Qty Req-4
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109024UR
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£14.50 ex VAT£17.40 inc UK VAT
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109495
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£3.20 ex VAT£3.84 inc UK VAT
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57110
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£0.43 ex VAT£0.52 inc UK VAT
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Fit these shims between Rocker Pedestals & Cylinder Head to maintain valve to rocker geometry. Originally these were .060 when our catalogue was written, however now only available in .030. Specially designed to maintain oil flow to Rockers.

For use only if the Cylinder Head has been over-skimmed or when using High Lift Camshaft.

1 or more shims required per Rocker Pedestal, these fit both 4 and 6 cylinder Triumph engines, please order as many as you need for your engine.
Qty Req-1, Model-Herald 13/60, Item Info 2-number 1
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144973SHIM
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£3.55 ex VAT£4.26 inc UK VAT
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Fit these shims between Rocker Pedestals & Cylinder Head to maintain valve to rocker geometry. Originally these were .060 when our catalogue was written, however now only available in .030. Specially designed to maintain oil flow to Rockers.

For use only if the Cylinder Head has been over-skimmed or when using High Lift Camshaft.

1 or more shims required per Rocker Pedestal, these fit both 4 and 6 cylinder Triumph engines, please order as many as you need for your engine.
Qty Req-a/r, Model-Herald 13/60, Item Info 2-for rocker pedestals
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144973SHIM
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£3.55 ex VAT£4.26 inc UK VAT
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104859
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£4.25 ex VAT£5.10 inc UK VAT
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132495
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£3.35 ex VAT£4.02 inc UK VAT
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GHF202
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£0.36 ex VAT£0.43 inc UK VAT
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5 out of 5 starsRead 1 Review(s)Rate and Review this Product
GHF302
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£0.13 ex VAT£0.16 inc UK VAT
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This set of solid spacers replaces the coil spring type spacers on the standard rocker shaft. They allow the rockers to rotate more easily and prolong shaft life by retaining the oil.

The set includes 3 spacers, 6 shims and 1 adjusting washer
Qty Req-2, Model-Herald 948, 1200 & 12/50, Item Info 2-intermediate springs
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105120SOLID
Out of stock, expected soon Jun 01, 2024. Add to cart and Back Order
£17.60 ex VAT£21.12 inc UK VAT
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105322
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£0.45 ex VAT£0.54 inc UK VAT
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105322
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£0.45 ex VAT£0.54 inc UK VAT
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5 out of 5 starsRead 1 Review(s)Rate and Review this Product
PC10
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£0.43 ex VAT£0.52 inc UK VAT
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12 month warranty
Worldwide shipping
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Customer Comments
"Regular customer and it's great to be able to find a good range of parts for our Stag and TR5." Customer Comment
Product Description

Triumph Herald Rocker Shaft and Fittings