Description Cooling conversion kit to suit 4age 20V engines For those doing a 20V rear wheel drive engine install this is our type-4 4age cooling conversion kit. These provide an easy and reliable way to convert a 20V 4age to have the water inlet and outlet at the front of the engine. – Upgrading from an older version 20V RWD cooling kit: For those who have either of our previous models of 20V RWD cooling kit and wish to upgrade to the current model shown here then a separate kit is available for purchase which only has the required parts to do so, please see here. Installation guide Click to view the guide on how to install this kit. Features and advantages – Ease of fitment: This kit is very easy and quick to install on the engine using only basic tools. No custom modifications are required and no unpleasant surprises. – Full bypass type cooling system: Helps to remove air locks and is intended to avoid any internal hot spots as well as also helping to stabilise the operating temperature. – Original water flow: Despite many misconceptions all of our kits have always used the same water flow path of the cooling part of the engine as used from original. – No external water pipes: Some rear wheel drive conversions use pipes extending all the way from the back of the engine to the radiator to transfer the water. These bulky, leak prone, more difficult to maintain and are prone to leave difficult to remove air-locks. – Universal water outlet provision: Choice of outlet provision to suit different applications, one kit will never suit all! See the section “Parts options” for more details. – Common thermostat: Pre-fitted inside the thermostat housing is the same type as fitted to 16V 4age engines and only genuine Toyota thermostats are used. – Suits original hoses: Using the supplied parts in the kit the factory fitted AE86 / AE71 radiator and heater hoses are able to be directly used. For other models it’s able to be easily adapted. – Water pump / alternator compatibility: Suits the original 20V water pump and the alternator / bracket from any model of 4age 20V. Parts options – Heater use: This kit is available with the option of a heater provision. The heater compatible kit features a water feed outlet in the rear housing, a return feed in the thermostat housing, a rubber joiner hose to the original heater pipe and the relevant clamps. These parts completely clear the OEM knock sensor which is critical for the use of the original ECU. – Custom options: For those who require a different size heater water feed or something different such as a turbo water feed then please make a note in the “comments” box that can be seen during the checkout and then send an email with the relevant request. Many different size barbs are kept in stock. Development and testing To improve on the already successful previous kit a new approach was needed. After the single longest part development time of any product to date we now have a kit that is a significant departure from not only our previous kits but also any other type offered elsewhere. To make sure this concept worked flawlessly a single prototype kit was made and fitted to the engine of a vehicle with an existing 20V conversion. This test vehicle was then used over extensive distances every day for four months. Since that time hundreds of these kits have been sold and are in reliable use across many countries. Supplied parts – Main thermostat housing: Assembled with the water inlet pipe, silicone joiner hoses and a genuine Toyota thermostat seal fitted internally. – Side block off plate: includes bolts and gasket. – Top water outlet. – Rear bypass plate. – Top extension hose. – Lower hose support. – Various clamps and other components. Notes – Upgrade kits: For those that wish to upgrade their earlier models of kits from us an upgrade pack is available here that is supplied with only the parts needed to make the change. – ISCV: The idle control valve needs to be relocated if a right hand heater outlet is used. This is easily done by unbolting the part, extending the hose and fitting a mini air filter to it’s intake. – These kits are subject to minor changes such as the type and colour of fasteners used / supplied. Additional information- Thread sizes Below are the thread specification for the rear water housing / Bypass plate when viewed from the rear of the engine. – ECU temperature sensor (Top left): M12 x 1.5mm (SENSOR NOT SUPPLIED) – Dash temperature sensor (Top right): M16 x 1.5mm (SENSOR NOT SUPPLIED) – Water fitting / Blanking provision (Both sizes): 3/8″ BSPT – (BSPP / BSP type fittings with parallel threads ARE NOT compatible)
