Toyota 42-6FGCU25:
Resolution to Problem of Extreme Condensation in Engine Oil

It is a 1998 model, 4Y dual fuel engine running on propane. Problem started about ten months ago when I noticed engine oil looking like beige coloured milk shake. I had a post here about it and suggestions were offered here. You can find my original post in the 42-6fgu25 section, titled "Foamy Engine Oil" I finally found the cause of the condensation and it was different from the suggestions made here.

Before I get to the resolution let me give you the history. Because of the condensation I changed the oil once a month/ 15hrs engine run time. New thermostat made no difference. Coolant level did not drop at all. Compression in the cylinders were good at 187psi in each of the four cylinders, leakdown ranged between 15 to 23%. Crankcase vacuum was at 0.8 in water column, and a new PCV showed no change in vacuum. I gutted the old PCV and installed it and the vacuum went up to 9.8 in wc. This eliminated about 90% of the condensation but this was only a band aid and not a solution to the problem.

I finally rebuilt the Aisan C propane regulator and that eliminated the excess moisture in the crankcase. The extremely rich propane mixture was the source of the moisture. There was quite a bit of oil in the regulator. The condensation started after we had just gotten the propane cylinder refilled and probably excess oil in the propane took out the regulator. I will be periodically draining the regulator.

What did I learn from all this? Overly rich propane mixtures can cause moisture condensation in the crankcase.
  • Posted 31 Jan 2015 03:40
  • Modified 31 Jan 2015 04:05 by poster
  • Discussion started by Georg
  • Ontario, Canada
1998 426FGCU25 Ser No 67740

Having trouble using the Discussion Forums? Contact us for help.

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

FOR SALE ON MACHINERY-ONQ

Caterpillar DP40K2
Netherlands
China
Netherlands
Australia Victoria
United States Pennsylvania

Upcoming Events

March 20-23, 2023 - Chicago, United States
May 18-20, 2023 - Guangzhou, China
June 28-29, 2023 - Frankfurt am Main, Germany

FOR SALE ON MACHINERY-ONQ

Nissan L01M15J
Australia Victoria
United States Pennsylvania
United States Pennsylvania
United States Pennsylvania

In the Virtual Expo

Tailift Z-Series lithium-battery electric forklifts
With a lifting capacity of 3,500 - 7,000 lbs and small turning radius, the Z-Series is built specifically to meet the needs of warehouses, distribution centers, and manufacturing facilities.

Next Editorial Features

SMART ATTACHMENTS - Mar 2023
DRIVERLESS/AUTOMATED MATERIALS HANDLING - Apr 2023

FOR SALE ON MACHINERY-ONQ

Load Lifter LABORER8000
Canada Ontario
United States Pennsylvania
United States Pennsylvania
Netherlands

Featured Business

GLOBAL POWER CO., LTD
View our amazing stock range such as the CT Power's 7L series forklifts here.

Latest Jobs

Sioux Falls, SD, United States
Le Mars, IA, United States
Philadelphia, Mississippi, United States
Melbourne, Australia

Next Editorial Features

SMART ATTACHMENTS - Mar 2023
DRIVERLESS/AUTOMATED MATERIALS HANDLING - Apr 2023