8V92 airbox drains - Printable Version
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8V92 airbox drains - Tf175 - 07-18-2019
Our airbox drains route into a catch can which has a radiator style drain cock . I have opened this drain a couple of times , didn't see more than a drop come out . Assumed the drain must be plugged . On the trip to Ohio this past weekend I saw elevated engine temps , especially on the return leg causing me to limit speed to 45 at times on level road . Needle was at 210 a lot , sometimes going above 210/215 but never to 230 . I will post more about this in appropriate place .
Back to the airbox , I was concerned about the high temps hurting the engine so was looking for coolant in the wrong places . Oil dipstick shows no sign or smell of coolant ( I know it should be analyzed) , exhaust looks good . Rad full . Unscrewed the drain cock completely from the airbox drain catch can , nothing came out . Removed hose at check valve , nothing . Removed check valve , it rattles , works as it should . Nothing came out of pipe from air box .
From what I have read , Detroit two stroke " slobber tubes " are known to drool fuel/oil . Just wondering what others have experienced before I pursue this further .
Thanks ,
Chris
RE: 8V92 airbox drains - TGDianics - 07-18-2019
Is the exterior of the radiator clean?
Is the fan belt properly adjusted?
Use a IR Thermometer to check the engine outlet temp, at the low side, of the thermostat housings on each cly head. Temps should be close. If a big difference suspect a thermostat failure.
Was the oil pressure lower than expected with the elevated temps? If not the water temp gage/sensor is suspect.
TG
RE: 8V92 airbox drains - bestgenman - 07-18-2019
Detroits should have air from the blower box drains at the engine when running. If not, they are plugged. Unplug them. There will always be oil from them as the piston wipes the cylinder wall. Some of that oil winds up in the blower box.
Since the radiator is aft of the engine, the blower box drains should be routed aft of the radiator. That keeps the oil out of the radiator fins which causes them to collect dirt and then stopping air flow through the core.
If you can rig up the canister, that works also. Just keep the oil out of the radiator. If you’re experiencing HWT, thoroughly clean the fins and core. You should be able to see through the core with a light.
My two cents worth.
RE: 8V92 airbox drains - Tf175 - 07-19-2019
There is a hose connected to each of the check valves coming off the air box drains , these hoses go directly to the canister/ catch tank . I have the check valve on the driver's side removed at the moment , and there is air coming out the pipe at idle and a drop of oil . No coolant .
Thanks,
Chris
RE: 8V92 airbox drains - Fulltiming - 07-19-2019
Last time I had my coach serviced, no oil came out of the canister drain valve. Leo removed the canister and it was half full of thick oil that had to be cleaned out by hand.
RE: 8V92 airbox drains - Tf175 - 07-20-2019
I put a small rod into the canister drain, got some oil to come out . I will also remove canister and hoses for cleaning. No coolant in either drain.
Thanks!
RE: 8V92 airbox drains - Tf175 - 07-24-2019
Testing the air box drain check valves . Left side closes off at 3 to 4 psi . Right side closes at 26 psi. Right side has a part number , looked it up , rated at 4psi . Checks are available with 1 or 4 psi rating . Suspect that there has been a loss of boost .
RE: 8V92 airbox drains - [email protected] - 06-03-2022
I’d love to see a picture of a catch tank for a 8V92. If mine ever had one it is long gone. Just a pair of tubes slobbering on the ground and the radiator remain!
RE: 8V92 airbox drains - Tf175 - 06-04-2022
Are you speaking of the convoluted metal tubes that come from the valve covers and route down either side of the engine ? Approximately one inch diameter ? If so, these are actually engine vent hoses .
RE: 8V92 airbox drains - whatsnewell - 06-05-2022
Here is what my 'catch tank' looks like in my 6v92...