Triumph TR5 Pressure Relief Valves - Later TR6 Alternative

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Part No.: GRID200262

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156167R
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£65.00 ex VAT£78.00 inc UK VAT
£125.00 ex VAT£150.00 inc UK VAT
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52
This PRV is recommended for use with 214347BOSCH , our cylindrical "Bosch" type pump kit.

It operates at 105psi with a Bosch pump fitted flowing at approx. 2.5 Litres per minute. It is not suitable for use with a Lucas pump which flows approx. 1.5 Litres per minute.

We will buy your old Lucas PRV from you to help keep other TR's on the road.
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156167B
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£145.00 ex VAT£174.00 inc UK VAT
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156167
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This on car adjustable Pressure Relief Valve (PRV) kit replaces the original PRV found in TR5's and TR6's. Being of a modern diaphragm design it will cure many problems inherent in the Lucas Mechanical Fuel Injection system.

The original PRV operates using the spring loaded plunger on a seat principle which is susceptible to resonance; a big problem with the original type valve when used in conjunction with a Bosch fuel pump. The added benefit of this is that braided hose, 153736SS, from the pump to PRV can be used without risk of exasperating the resonance. With the original type PRV installed a hard lined or externally braided hose will cause considerable resonance (high noise levels) so a soft rubber hose must be used.

On the original PRV the adjuster is internal and is only accessible once the fuel return pipe has been removed. This means that a real time pressure reading cannot be taken whilst making an adjustment as the fuel line needs to be refitted first. This new PRV has an external adjuster which means fuel pressure can be adjusted with the pump running and monitored at the same time.

This on car adjustable, uprated PRV is compatible with Ethanol and therefore, is safe to use with modern fuels.

The kit is supplied with full instructions and all the fittings necessary to complete the installation however the pressure will need to be set and a pressure gauge will be required (see RR1558)

This PRV kit will not fit with a Lucas fuel pump unless the pipework is reconfigured so that the PRV is moved out of the way of the CAV filter and its pipework. TR5 owners with the PRV on the chassis are strongly advised to re-engineer the pipework to conform to the TR6 arrangement where the PRV is positioned to the left hand side of the petrol tank (information is provided in the fitting instructions).
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156167UR
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£165.00 ex VAT£198.00 inc UK VAT
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156167R
In stock
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£65.00 ex VAT£78.00 inc UK VAT
£125.00 ex VAT£150.00 inc UK VAT
Quantity
54
This PRV is recommended for use with 214347BOSCH , our cylindrical "Bosch" type pump kit.

It operates at 105psi with a Bosch pump fitted flowing at approx. 2.5 Litres per minute. It is not suitable for use with a Lucas pump which flows approx. 1.5 Litres per minute.

We will buy your old Lucas PRV from you to help keep other TR's on the road.
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156167B
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£145.00 ex VAT£174.00 inc UK VAT
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152068
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152068
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58
Has M6 metric thread - use nut GHF212
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UKC2451
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WC701121
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GHF331
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GHF200
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N.I.
With Lucas fuel injection systems, the delivered fuel pressure is critical to the performance of system components (metering pump, injectors etc) so should be the first port of call when investigating problems.
This kit displays the fuel pressure accurately via a damped gauge.

If necessary the fuel pressure can be adjusted by:-
  • Early models - shimming the pressure relief valve
  • Late models - turning the nylon adjusting screw on the pressure relief valve
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RR1558
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£260.00 ex VAT£312.00 inc UK VAT
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12 month warranty
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Product Description

Triumph TR5 Pressure Relief Valves - Later TR6 Alternative
All units are calibrated to give 105-110 p.s.i., which is the correct working fuel pressure for these Lucas injection systems. TR5 and early TR6 models had a short  (3/8 in.) valve. Later TR6’s had a longer (1 1/4 in.) valve. They are interchangeable. The design change was adopted to help to stop valve body distortion and subsequent relief valve pressure fluctuations.  For information on setting the pressure relief valve, please refer to the workshop manual.