Re: Heater hose routing 52
Posted by HH56 On 2016/3/15 12:32:08
It is really not that critical function wise as everything is in series. The hot water outlet is the fitting on the head and for best control would go to the valve first and then the heater(s) in series with return to the water pump. One thing mentioned in a service article on the 48-50 valve is to have the hose from head go to the small curved tube on the valve and the straight tube on valve to heater core. That prevents an intermittent clicking noise as the flow is not trying to force the valve open. No mention of that in later install instructions but since that portion of the valves are virtually identical it probably is still a valid suggestion.
Since Packard did not see fit to publish plumbing info in the 51-4 manual here is the layout from a 55-6 manual. You can duplicate the routing and substitute the hot water outlet fitting on top of the 52 head in place of the V8 fitting which was next to firewall on the end of head. The return hose clamp is on the 52 fender instead of the engine but otherwise the hose routes are virtually identical. If you don't have the underseat unit then ignore those 2 hoses and use the top heater fitting to return to water pump.
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Since Packard did not see fit to publish plumbing info in the 51-4 manual here is the layout from a 55-6 manual. You can duplicate the routing and substitute the hot water outlet fitting on top of the 52 head in place of the V8 fitting which was next to firewall on the end of head. The return hose clamp is on the 52 fender instead of the engine but otherwise the hose routes are virtually identical. If you don't have the underseat unit then ignore those 2 hoses and use the top heater fitting to return to water pump.
Attach file:
(65.92 KB)
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