Hey guys,
My friend and I own an 1978 E34 and have been restoring various elements of the engine to get it running in optimally. As part of this work, I have replaced the water pump, impeller within, all hoses from seacock to exhaust manifold, Petro added a sea screen, replaced thermostat and rebuilt the carb. The engine runs quite well now!
We recently took her out and noticed that she stopped spitting water with the exhaust and the temp shot to 250. We turned around and headed back the 200 yards we'd traveled. We do not have a heat exchanger and only the raw water cooling, thru sea screen and water pump. We notice now that the sea screen is being back-filled with water from the engine as it's hot as shit and dark grey or black.
Primary issue to resolve:
Raw water being pumped in but not exiting the wet exhaust port.
Things I've done to troubleshoot:
ericsonyachts.org
I know this is a lengthy post though, trying to provide all my steps to isolate the problem and make it easy for people to offer advice and experience.
Thanks!
Buzz
My friend and I own an 1978 E34 and have been restoring various elements of the engine to get it running in optimally. As part of this work, I have replaced the water pump, impeller within, all hoses from seacock to exhaust manifold, Petro added a sea screen, replaced thermostat and rebuilt the carb. The engine runs quite well now!
We recently took her out and noticed that she stopped spitting water with the exhaust and the temp shot to 250. We turned around and headed back the 200 yards we'd traveled. We do not have a heat exchanger and only the raw water cooling, thru sea screen and water pump. We notice now that the sea screen is being back-filled with water from the engine as it's hot as shit and dark grey or black.
Primary issue to resolve:
Raw water being pumped in but not exiting the wet exhaust port.
Things I've done to troubleshoot:
- I have tested the flow of raw water from seacock, thru sea screen and into the water pump. Looks good.
- Manually turned over engine with water pump cover off and impeller is rotating freely and looks good.
- I pulled the output hose from the block side to test water flow through pump. Looks good, like a garden hose flow.
- Have also now removed all the hoses from pump to "tee", to thermostat and over to manifold. All hoses are new and clear of any debris.
- Removed and cleaned the connector elbow from the exhaust manifold that goes to muffler. That had a ton of carbon build-up so cleaned that and reinstalled.
- Removed newly installed thermostat for inspection and cleaning, reinstalled. (Of note, this looks like a cheaper chrome version of the brass one I removed last summer).
- Removed the hose from the block that runs to the muffler to see if water is exiting the engine block. Failed, no water exiting this hose so, I know the problem is in the block and/or water cooled system somewhere.
- Since all the hoses appear to be clear, could the thermostat be faulty and not opening up to allow water flow through to exhaust? (This seems like one of the places in the system where blockage could occur.)
- If I need to dig further, would it help to take the engine manifold off to inspect for corrosion inside the block? (I am not certain whether I should check here since raw water cooling seems to route to specific places in the block.
Atomic 4 overheating
Hey y'all, Ok, so I have a 1978 E34 moored in salt water. We've replaced the carb, oil filter, water separator, impeller, hoses, and much much more. We have it all dialed in when idling at the dock. Spits water normally and hums right along. We took her out of the slip recently and I noticed...
I know this is a lengthy post though, trying to provide all my steps to isolate the problem and make it easy for people to offer advice and experience.
Thanks!
Buzz