Triumph TR6 Pressure Relief Valve - Pi Late

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Part No.: GRID600046

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Has M6 metric thread - use nut GHF212
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This item has an exchange surcharge which is refundable on return, see terms and conditions.
1 Pressure Relief Valve (Short) - Part No. 149811R

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149811R
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156167
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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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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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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
Out of stock, expected soon Jun 01, 2024. Add to cart and Back Order
£260.00 ex VAT£312.00 inc UK VAT
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12 month warranty
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Customer Comments
"Nice to see someone who cares for spare parts to MG's" Customer Comment
Product Description

Triumph TR6 Pressure Relief Valve - Pi Late
See ‘Fuel System - Injection’ for breakdown of pressure relief valve assemblies
TR6 Fuel System from Commission No CP50001 and all CR
Problem Solving:
The most common problems affecting TR6s these days is their low usage and the periods that they spend in storage. Even in dry garages the inside the inside of the fuel tank may corrode shedding fine iron sediment as soon as the car is moved. Once corrosion has started it may be more expensive to cure/eradicate than the cost of a new tank.
If a problem is suspected, the tank may have to be flushed by filling and draining several times. Another common ailment is caused by water, which will sit at the bottom of the tank, under the fuel, and cause corrosion. This may actually get as far as the engine when it will cause havoc to a metering unit or injector.
The P.I. system may need pressure checking at several points to identify a problem. The pressure relief valve (PRV) should ‘blow’ at 105 - 110 PSI, and there should be over 90 PSI at the metering unit outlets. Injectors pop at 45-55 PSI. Rebuilt injectors are tested to perform within this pressure window, and spray an even cone of fuel.