6.8 Forklift Engine
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6.8 Forklift Engine
The other day we noticed a bit of a misfire on startup and a sulfur or coolant smell coming from the exhaust. I scanned the engine with our diagnostic software and found a code for the pre-cat o2 sensor open/lazy. While looking at the sensor I noticed coolant dripping out of the exhaust pipe.
I started pulling spark plugs and found the #5 plug to be wet with coolant. All the other plugs were dry. While I had them out I performed a compression test. Most cylinders were at 180 while one was at 110 and another at 240. #5 cylinder is at 180.
I noticed the crossover of the thermostat housing through the intake manifold. Is it a common issue for that gasket to go bad and leak into 5 cylinder.
I started pulling spark plugs and found the #5 plug to be wet with coolant. All the other plugs were dry. While I had them out I performed a compression test. Most cylinders were at 180 while one was at 110 and another at 240. #5 cylinder is at 180.
I noticed the crossover of the thermostat housing through the intake manifold. Is it a common issue for that gasket to go bad and leak into 5 cylinder.
Cargo Master
Joined: Apr 2013
Posts: 3,087
Likes: 24
From: Central Florida
The other day we noticed a bit of a misfire on startup and a sulfur or coolant smell coming from the exhaust. I scanned the engine with our diagnostic software and found a code for the pre-cat o2 sensor open/lazy. While looking at the sensor I noticed coolant dripping out of the exhaust pipe.
I started pulling spark plugs and found the #5 plug to be wet with coolant. All the other plugs were dry. While I had them out I performed a compression test. Most cylinders were at 180 while one was at 110 and another at 240. #5 cylinder is at 180.
I noticed the crossover of the thermostat housing through the intake manifold. Is it a common issue for that gasket to go bad and leak into 5 cylinder.
I started pulling spark plugs and found the #5 plug to be wet with coolant. All the other plugs were dry. While I had them out I performed a compression test. Most cylinders were at 180 while one was at 110 and another at 240. #5 cylinder is at 180.
I noticed the crossover of the thermostat housing through the intake manifold. Is it a common issue for that gasket to go bad and leak into 5 cylinder.
Suspiciously my v10 also had an issue with #5 getting coolant.
Cargo Master
Joined: Apr 2013
Posts: 3,087
Likes: 24
From: Central Florida
More Turbo
Joined: Dec 2017
Posts: 587
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I've got a 3V, and I've found coolant in my plug hole on #5 as well. Haven't really had problems with it getting beyond that, but has caused a misfire in the past. Intermittent problem for me, headache to diagnose.
Tuned
Joined: Aug 2018
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