4.0 just stopped at 70mph
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From: WINNIPEG
4.0 just stopped at 70mph
Hi, I bought my 2010 Ranger new in 2010, It has a 4.0l with a 5 speed manual and AC. It has about 175,000 miles on it. I had the front timing components including two hydraulic tensioners and water pump all replaced at about 140,000 miles. A few days ago driving down the highway at 70mph I felt a bump and at the same time the truck lost power. The tach had dropped to zero, engine stopped, so I just let the truck coast to a stop after disengaging the transmission. Tried cranking but it sounded odd so I stopped. Pulling the valve cover the timing chain at the rear of the engine is slack. Compression is almost nothing. I didn't investigate further. The vehicle is serviced regularly, filters and oil changed. It has been a great truck still in good condition, and I am hopeful to fix it and drive another 150,000 miles. Thanks in advance.
Does this sound like a rear timing chain/component failure or something else?
Does this sound like a rear timing chain/component failure or something else?
If there is little or no compression then yes, its a timing chain issue
Engine will need to come out
Since you mentioned "front timing components" I assume the engine wasn't pulled out for those repairs/updates
And why were those repairs done?
Was there a noise?
Usually there is no engine damage, i.e. valve strikes piston top, when timing goes off in theses engines, but it can happen, as the 4.0l SOHC IS an interference engine, the 4.0l OHV engine wasn't
The cam gears in these are friction fit, no key ways, so if a gear was torqued to spec it could spin on the shaft causing the loss of compression
Slack rear chain would make a "rattle" noise but engine shouldn't loose much compression, i.e. wouldn't stall, unless chain broke
Engine will need to come out
Since you mentioned "front timing components" I assume the engine wasn't pulled out for those repairs/updates
And why were those repairs done?
Was there a noise?
Usually there is no engine damage, i.e. valve strikes piston top, when timing goes off in theses engines, but it can happen, as the 4.0l SOHC IS an interference engine, the 4.0l OHV engine wasn't
The cam gears in these are friction fit, no key ways, so if a gear was torqued to spec it could spin on the shaft causing the loss of compression
Slack rear chain would make a "rattle" noise but engine shouldn't loose much compression, i.e. wouldn't stall, unless chain broke
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From: WINNIPEG
If there is little or no compression then yes, its a timing chain issue
Engine will need to come out
Since you mentioned "front timing components" I assume the engine wasn't pulled out for those repairs/updates
And why were those repairs done?
Was there a noise?
Usually there is no engine damage, i.e. valve strikes piston top, when timing goes off in theses engines, but it can happen, as the 4.0l SOHC IS an interference engine, the 4.0l OHV engine wasn't
The cam gears in these are friction fit, no key ways, so if a gear was torqued to spec it could spin on the shaft causing the loss of compression
Slack rear chain would make a "rattle" noise but engine shouldn't loose much compression, i.e. wouldn't stall, unless chain broke
Engine will need to come out
Since you mentioned "front timing components" I assume the engine wasn't pulled out for those repairs/updates
And why were those repairs done?
Was there a noise?
Usually there is no engine damage, i.e. valve strikes piston top, when timing goes off in theses engines, but it can happen, as the 4.0l SOHC IS an interference engine, the 4.0l OHV engine wasn't
The cam gears in these are friction fit, no key ways, so if a gear was torqued to spec it could spin on the shaft causing the loss of compression
Slack rear chain would make a "rattle" noise but engine shouldn't loose much compression, i.e. wouldn't stall, unless chain broke
There was a racket coming from the front of the engine. Engine was not removed when the timing components were installed.
I don't want to pull the engine if it is a different problem. Regardless I will get the real hydraulic tensioner changed.
Do you have any ideas of what I can check to see if it is a different problem?
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