Triumph Dolomite 1500/1300 Cylinder Head and Fittings

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Part No.: GRID008439

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1 Rocker Shaft Complete Assembly (Recon) - Part No. 144962R ASSY
Qty Req-1, Model-1500/1300
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144962RASSY
In stock
£131.00 ex VAT£157.20 inc UK VAT
£50.00 ex VAT£60.00 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
In stock
£15.50 ex VAT£18.60 inc UK VAT
Quantity
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
In stock
£14.50 ex VAT£17.40 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-1500/1300, Item Info 2-front/centre/rear
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144973SHIM
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£3.55 ex VAT£4.26 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-1
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105120SOLID
In stock
£17.60 ex VAT£21.12 inc UK VAT
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Alloy rocker covers are suitable for all standard 4 cylinder Triumph engines improving both the appearance and quietness of the engine. Use with AJM414T gasket(s) as required.

Late 1500 engines (Spitfire FM80001E onwards or MG Midget 1977 onwards) will also need to fit the longer, earlier studs (105123 x 2). These enable the chrome nuts to be used to replace the standard steel tube nuts.

If your engine has any of the following modifications or repairs you will need to check tappet screw to cover clearance prior to engine start up:
High Lift Cam Installed.
Heavily skimmed cylinder head or block.
Shimmed rocker shaft pedestals.

You can compensate for these modifications/repairs with multiple rocker cover gaskets AJM414T. Always check for adequate bonnet clearance once installed.
Qty Req-1, Model-1500/1300
5 out of 5 starsRead 3 Review(s)Rate and Review this Product
214814ALLOY
In stock
£40.00 ex VAT£48.00 inc UK VAT
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The Oil Filler Cap (pressed steel-bayonet type) - 598231P is a crucial component in the maintenance and operation of various automotive systems. This cap is specially designed to ensure the safe and efficient sealing of oil reservoirs and containers, preventing contaminants from entering while allowing for easy access during maintenance.

Fits many Triumph models, Land Rover Defender and MG Midget.
  • Oil Filler Cap
  • Oil Filler Cap (pressed steel-bayonet type)
Qty Req-1, Model-1500/1300
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598231P
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£3.65 ex VAT£4.38 inc UK VAT
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The use of head studs will aid in cylinder head installation, simply from a standpoint of gasket and head alignment.
Qty Req-8, Model-1500/1300
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105121
In stock
£6.00 ex VAT£7.20 inc UK VAT
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To suit all 1296cc and 1493cc models
Torque 45 lb/ft with ARP ultra lube
Qty Req-8, Model-1500/1300
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105121K
In stock
£143.00 ex VAT£171.60 inc UK VAT
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Swivel wrench with plastic coated T handle.
Socket forged steel hardened, tempered and chrome plated with
rubber insert for spark plug insulator protection and retention.
Universal jointed for enhanced access.
Qty Req-1, Model-1500/1300
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GAT140
In stock
£7.25 ex VAT£8.70 inc UK VAT
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12 month warranty
Worldwide shipping
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Product Description

Triumph Dolomite 1500/1300 Cylinder Head and Fittings

Review: Chris Apostolides Submitted: 04/07/2020

Overall5 out of 5 stars.
verified

Subject
All brand new parts and good quality

Did this item work well with your project? What vehicle type are you using this for?
Everything needed was included. Good quality at a reasonable price. Recommended.