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4.0 SOHC won't start after top timing chain tensioner change


Texan209

Forum Member

Joined
Oct 10, 2024
Messages
18
Points
101
City
Austin, Tx
State - Country
TX - USA
Vehicle Year
2004
Vehicle
Ford Ranger
Drive
2WD
Engine
4.0 V6
Transmission
Automatic
So... I may have gotten myself in too deep but I thought I heard the infamous chain slap on startup the other day so I decided it was finally time to change timing chain tensioners. I'm very much a shade-tree mechanic, but I recently replaced my thermostat housing, so it's a pretty similar process to get to the tensioner. Unfortunately, everything is back together and the truck won't start.

I installed it dry but cranked the engine in "clear flooded engine" mode for several seconds a couple of times to build oil pressure before starting.
When it came time to turn the key, I got a few pops like it was trying to start, but it sounded pretty rough so I stopped cranking.

I have yet to hook up an OBDII to it, but I've rechecked the spark plug wires, vacuum lines and electrical connections, and it all looks correct. I'll re-check everything a third time with fresh eyes, but I'm operating on the assumption that it's all back together correctly.

This brings me to the question of - is it realistic that the timing moved on me during the switch? All I did was unscrew one tensioner (top drivers side) and replace it - truck didn't move or do anything that I would expect to change the timing, but here we are.

Has anyone heard of this before, or had a similar experience? From the research I did intially, it sounded like a pretty straightforward piece of maintenance.
 

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