When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Note to taking the factory lines off the block and plugging the ports... From foggy memory you'll want to do a little magic to the oil thermostat in the block where the hoses attach. Last I heard, just disconnecting and blocking the oil flow that used to go through the cooler means you would no longer have the oil flow that used to go through the cooler. That oil flow is handy to have, particularly whenever the engine is running.
Note to taking the factory lines off the block and plugging the ports... From foggy memory you'll want to do a little magic to the oil thermostat in the block where the hoses attach. Last I heard, just disconnecting and blocking the oil flow that used to go through the cooler means you would no longer have the oil flow that used to go through the cooler. That oil flow is handy to have, particularly whenever the engine is running.
Correct you also need to remove the oil thermostat from the housing above the oil pressure sending unit other wise you rely only on the emergency pressure bypass which allows some oil to get around the thermostat .......the smaller lighter spring and plunger in that housing not the heavier main oil pressure blow off...the two horizontal plugs in the housing.
its not that effective of a cooler anyway. very surprising.... kind of an afterthought type design. hmm " lets use the hot radiator that is near 180 degrees to cool the oil that is near 220 degrees on a hot day." pretty stupid!
Stupid maybe but hot days were not only concern Porsche had when they designed 928. Having water and oil exchange heat means starting up in cold day is more comfortable. These cars were made to be used all year round no matter what weather, not just on sunny day in race track.
I have no intention of removing the lines. Just need to replace, but when I found this thread during search (and a few others) it looked like folks were removing the lines altogether, so I wasn't sure if this was a good thing or not. I will replace the hoses, but want to make sure I do not mess them up or my block (or radiator end tank) in the process.
...but want to make sure I do not mess them up or my block (or radiator end tank) in the process.
Get the right-sized wrenches to counter-hold the fittings. Both ends have an adapter that's big. Off the top of my head, (OTTOMH?) I use a 1 1/4" on the radiator.
Get the right-sized wrenches to counter-hold the fittings. Both ends have an adapter that's big. Off the top of my head, (OTTOMH?) I use a 1 1/4" on the radiator.
Don't know about the block end of the hose, but the radiator end is a 27mm on the hose and a 32mm (which is very close to 1 1/4) on the fitting on the radiator.
I want to get ahead of coolant and oil mixing due to a failed radiator/oil cooler or lack thereof. inCARnation on youtube mentions the mixing of oil and coolant being a common issue particularly in automatic 928s.
As i understand it, 78-79 had oil coolers.
80-84 (US spec) did not have oil coolers.
Any thoughts on an aluminum radiator with 2 oil coolers like the below solving the possible issue of oil and coolant mixing?
Will replacing the stock radiator on my 1980 5 speed with an aluminum radiator with 2 oil coolers give me peace of mind?
I'm not suggesting the aluminum radiator below is the solution but its curious why its so inexpensive? Is there a recommended consensus aluminum radiator? Should any replacement radiator have 2 oil coolers?
Also, would any replacement be a straight forward install for a medium skill level weekend enthusiast that doesn't require any modifications to stock mounting?
Any thoughts/criticisms/advice/instructions/diagrams much appreciated - feel free to be direct.
Last edited by 928Collector; 12-26-2023 at 09:05 PM.
Two of my 928s have CSF radiators installed that are commonly sold for the 928s. They fit well and work fine.
My US Spec 1979 doesn't have oil cooler lines, my Euro 1979 has the oil cooler lines.
I did have a problem with the gaskets in the CSF radiator fitting (Gasket?) fail between radiator and the fitting to attach the oil line connections on a brand new radiator. That was reported and I hope they fixed the problem, or you should inspect it prior to installation.
04-30-2016, 02:18 PM
