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Oil leak at turbo

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Oil leak at turbo

Postby Bmac193 » Sat Jul 11, 2020 4:07 pm

Hey guys
Got a 98 rodeo with a Chinese copy of the 4JB1-T engine and an after market RHF5 turbo. She keeps leaking oil from the turbo outlet hose. I've been to see a mechanic who suggested a high flow air filter and a catch can. I fitted a K&N air filter and a ryco rcc350 catch can which worked for a while but it's pulling oil past the catch can and leaking again. Thought the catch can might be full but it still happens even when there is very little oil in the can. I put the rocker cover off the old engine on as the new one doesn't have an outlet for the breather on the dipstick but this seems to make the problem worse. Not sure where to go from here, any suggestions would be much appreciated.
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Re: Oil leak at turbo

Postby jacksonliam341 » Sat Oct 30, 2021 5:45 am

Oil leaks can be caused by a variety of factors, the main factor being incorrect pressure within the compressor and turbine housings. Oil leaks can cause catastrophic damage to the bearing systems and occur within seconds of the turbocharger commencing operation.

When a turbocharger is installed correctly, it should NOT leak oil, however, there can be cases where oil leaks occur. The following highlights some of the main causes and signs of oil leaks.

An oil leak can also occur when engines are running on idle. The pressure within the housings is lower, which in turn can lead to a vacuum being created, causing the oil to leak into the turbine housing. Once the engine starts to run at normal speeds the pressures will be restored and the leaks will stop.
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Re: Oil leak at turbo

Postby geeves » Sat Oct 30, 2021 2:06 pm

Make sure we are talking the same hose. The hose from the turbo to the intercooler can seep oil. Messy but not uncommon. This oil is formed by engine blow by and travels from the rocker cover breather through the ventilation into the turbo and because its under pressure after the turbo is forced through the hose. Even an engine with unmeasurable oil consumption will have some. If your oil use is minimal ignore it
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Oil leak at turbo

Postby Jamessweet » Fri Feb 24, 2023 11:32 pm

Bmac193 wrote:Hey guys
Got a 98 rodeo with a Chinese copy of the 4JB1-T engine and an after market RHF5 turbo. She keeps leaking oil from the turbo outlet hose. I've been to see a mechanic who suggested a high flow air filter and a catch can. I fitted a K&N air filter and a ryco rcc350 catch can which worked for a while but it's pulling oil past the catch can and leaking again here. Thought the catch can might be full but it still happens even when there is very little oil in the can. I put the rocker cover off the old engine on as the new one doesn't have an outlet for the breather on the dipstick but this seems to make the problem worse. Not sure where to go from here, any suggestions would be much appreciated.


It sounds like you are experiencing an ongoing issue with oil leakage from the turbo outlet hose on your 98 Rodeo with a Chinese copy of the 4JB1-T engine and an after-market RHF5 turbo. You've already tried a high flow air filter and a catch can, specifically a K&N air filter and a ryco rcc350 catch can, but it seems that oil is still being pulled past the catch can and leaking.

You mention that you tried putting the rocker cover off the old engine on as the new one doesn't have an outlet for the breather on the dipstick, but this seems to have made the problem worse. At this point, you're not sure where to go from here and are looking for suggestions.

It's possible that the catch can you are using is not effective enough to handle the amount of oil being produced by your engine. You may want to try a larger or more effective catch can to see if that helps.

Another potential issue could be with the turbo itself. If the turbo is not functioning properly, it could be causing excess oil to leak from the outlet hose. It might be a good idea to have the turbo inspected by a mechanic to see if there are any issues that need to be addressed.

Lastly, you may want to consider consulting with a specialist who has experience working with the specific type of engine and turbo that you have. They may be able to provide more targeted advice and recommendations to help resolve the issue.
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