On the 3.5/3.7 Cyclone V6, the water pump lives inside the engine, driven by the timing chain, and when it fails, it can leak coolant straight into your oil. We replace the pump and service the timing components at your home.
Most engines bolt the water pump to the outside of the block where a failing pump just drips on your driveway. Ford's 3.5/3.7 Cyclone V6 put the pump inside the engine, driven by the timing chain. When the pump's internal seals wear out, coolant has two places to go: out a small weep passage if you're lucky, or past the seal and directly into the engine oil if you're not. Coolant-contaminated oil destroys bearings fast, which is why this design ended up the subject of a class-action lawsuit.
The cruel part is how quietly it starts. The reservoir level drops with no puddle and no smell. Then the temperature gauge starts creeping on a hot day in 401 traffic. By the time the oil looks milky on the dipstick or under the fill cap, coolant has been circulating through the bottom end. Some owners also hear a rattle from the timing area as the pump bearing wobbles and disturbs the chain.
Caught early, this is a big-but-contained job: timing cover off, new pump, and new chains, guides and tensioners while everything's apart. Caught late, it's a seized engine. The difference between those two outcomes is usually just a few weeks of ignored coolant loss.
If your Ford is doing any of these, this is the likely cause:
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Internal Water Pump & Timing Service is a big job and shops quote $3,500–$7,000 for it. The single most valuable thing you can do before committing that is have the diagnosis confirmed independently, $100–$250 flat, at your location, no hoist needed, because a diagnosis isn't the repair. Plenty of cars arrive at that quote and turn out to need the smaller version of the problem.
And the honest scoping condition, up front: once I've seen it, I tell you straight whether it's something I can do at your place. If it needs a hoist, a press or a machine shop, I say so and point you to someone who has one. I don't take a job and figure it out in your driveway. That's the whole deal, and it's why the diagnosis comes first.
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Coolant in engine oil is the one leak you cannot drive on. Oil diluted with coolant loses its film strength, and rod and main bearings wear in hundreds of kilometres, not tens of thousands. A pump-and-timing service caught at the coolant-loss stage saves the engine; the same symptom ignored for a month routinely ends in a replacement engine.
Yes, with the right preparation. We do the full teardown, accessories, mounts, timing cover, in your driveway with proper engine support equipment. It's a long day and we're upfront about that, but you skip the tow and the week-long shop queue. We come to you.
Because the pump is buried behind the timing cover, the book time is enormous, and on transverse models some dealers quote pulling the engine entirely, which is the top of that range. We quote one flat price for the complete job, pump plus timing components, in writing before any work starts.
On this engine specifically, no. 'A bit of coolant, no leak' is exactly how internal pump failure presents. The risk isn't running low on coolant, it's the seal letting coolant into the oil, which kills bearings quickly. Get the oil checked now; if it's still clean, you've caught it at the cheap stage.
Yes, it's the smart move and we treat it as part of the job. Getting to the pump means removing the timing chain anyway, so chains, guides and tensioners add only parts cost. Skipping them means paying the entire teardown again the day a tensioner gets noisy.
Send it over for a free second opinion. I'll tell you straight what the job actually involves, and if their quote is fair, I'll tell you that too.
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