Why is my timing chain tensioner losing tension when hand cranking?
Hydraulic tensioners rely on engine oil pressure to stay firm, so they naturally lose tension and slacken when the engine is only manually cranked without running oil pressure. This makes the tensioner pop in and out during manual rotation, which is a normal behavior rather than a mechanical failure as long as the timing marks remain aligned.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
Why is my timing chain tensioner losing tension when hand cranking?
- 1relying on oil pressure to prime and tension the component upon engine startupDid this help you?
- 2checking and ensuring correct torque specificationsDid this help you?
- 3Checking the cable under the vehicleDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Now when I press the parking brake down it takes essentially no effort.”source ↗
“So I’ve found the cable but it’s still connected. I don’t know what it was like before so I can’t really tell if it’s loose or if it’s how it should be.”source ↗
“I'm attempting the water pump fix on my 3.5 Ecoboost Explorer. I just put the timing chain tensioner back on. All of my marks are aligned, but I noticed when hand crank the crankshaft that my tensioner is losing tension and popping in and out.”source ↗
Where this came up
People with this problem also raised
- 2How to release tension on a serpentine belt tensioner
- 2Camshaft timing off by half a tooth after rotating engine
- 4What to do if you overtightened a suspension bolt
- 3How to remove a stripped or over tightened lug nut when tools break
- 4How to learn car engine repairs like timing chains and flywheels
- 9Why is my engine pulley wobbling and making a grinding noise?