- Mon Dec 21, 2015 8:13 am
#357924
Water PumpI just got back in town a couple weeks ago. I had been learning how to rebuild transmissions with my older brother who has been doing it since the late nineties. My son had been driving my cars, alternating between them to keep the batteries charged. The day I get back he notices a big puddle of coolant under the hatchback. I had replaced all the water hoses a couple months ago, so I was thinking it must be the water pump. Green drops coming out from behind the crank pulley confirmed it.
Water pumps are designed to weep coolant when the seal around the bearing fails. Coolant contaminating the bearing would destroy it. Engineers have decided it would be better to alert you by pissing coolant everywhere than to wait until the pump stops turning and snaps your timing belt.
PartsIf you're going to do this, get the timing belt kit. It's about the same price as a water pump and timing belt so the tensioner is free. If the tensioner bearing is still good and it's not time to do the timing belt, you can save money and just get the pump. It's up to you. The VX kit isn't common and has to be ordered. If your accessory belts are cracking, you should replace those too. You'll also need coolant. The spark plugs are coming out so you can do those now if they're about due.
To get access to the crank pulley you have to remove the lower splash guard. I took it off halfway and let it hang, but I regret it because it kept getting in the way. Just take it all the way off. Set your heater temp to full hot and drain the coolant.
You have to take off the valve cover to get the upper timing belt cover off. The upper timing belt cover overlaps the lower. You should also remove the spark plugs because it makes it easier to rotate the engine by hand.
There are two 10mm bolts at each side of the upper timing belt cover. Once it's off, turn the crank pulley counterclockwise by the 17mm bolt until the pointer on the lower cover is at the white mark standing off from the three other marks. "UP" on the cam sprocket should be at the top of its rotation. If it's at the bottom, turn the crank pulley one more rotation.
I took this pics at an angle so you can see the pointer, but it should be lined up when tdc'ing the engine.
The engine gets hard to turn as you're approaching tdc and then suddenly gets easier, causing you to overshoot the mark. If you overshoot it, you can't turn it clockwise back to the mark because you will tension the belt the wrong way and cause the timing to be off. You can turn it clockwise a quarter turn and try again.
Now you have to get the accessory belts out of the way. My car has air conditioning and an alternator but no power steering. Disconnect the battery ground before messing with the alternator. There are three bolts on the alternator. You can loosen the lower one and leave it in but the upper two need to come all the way out because the bracket bolt holds the water pump down. To take the AC belt all the way off, you'd have to undo the engine mount. That's a big hassle, but there's no need. Just let it hang out of the way.
This is what an engine looks like after 315k miles. This nastiness wont be tolerated once I get it rebuilt.The VX crank pulley doesn't have the big hex section for a crank pulley tool. The bolt was stuck and I wasn't getting anywhere with the impact. I hosed the crank pulley bolt with PB Blaster, put the trans in gear, then propped a pole between the seat and the brake pedal to keep the brakes held down. That still didn't get it so I texted dem0nk1d and he dropped by with a care package: better impact and a torch.
After several attempts, the crank pulley bolt started to turn slowly and then zipped off. Be careful not to lose the keyway when you pull the pulley off.
Now take off the lower cover. This pic shows you where all the bolts are.
Clean out this drain section. I would have cleaned up the whole cover but I was rushing to get this finished and I plan to have this engine out soon anyway.
Unhook the tensioner spring and then break loose the adjustment bolt so you can remove the timing belt.
Besides the obvious 10mm bolts holding the water pump down, the alternator bracket bolt has to come out as well. Clean the surface off for the new pump. A scotch pad works best.
Compare the old pump to the new one. The VX pump is different than DX and EX/Si.
Now install the new pump, timing belt, and tensioner. Put the spring on and make sure the tensioner is on the little tab. Tighten the bolt finger tight and install the lower timing belt cover and crank pulley. Cover bolt torque spec is 7 ft/lbs and crank pulley bolt torque spec is 134 ft/lbs but most torque wrenches don't go that high. The belt guide goes on concave side facing out. Rotate the engine counterclockwise a couple times and recheck the timing. If it's off, mark it, slip it off the cam sprocket, turn the sprocket, then slip it back on and try it again. Torque the adjustment bolt to 33 ft/lbs (if you can get a torque wrench in there) and put the upper timing belt cover back on.
Clean the valve cover gasket mating surface and inspect the gasket. It should be flexible and not hard and cracked. Remove any old sealant and wipe oil off the gasket, careful that you don't stretch it out. Hondabond at the 90 degree bends is recommended but not always necessary. Make sure the spark plug tube seals slide around the tubes. Torque the valve cover bolts to 7 ft/lbs. These are prone to stripping and breaking because the torque spec is lower than anyone expects. Put the spark plug wires back in, put the breather hose back on and reconnect the valve cover ground.
Use a pry bar to hold tension on the alternator belt as you tighten the upper retaining bolt. This one is 17 ft/lbs while the bracket and lower bolt are 33. Don't forget to tighten the lower nut. Everyone forgets. Install and tension the AC and power steering belts if you have them.
Pour coolant into the radiator and start the engine. It should be idling normal unless your cam timing is off. Let it warm up to operating temperature with the cap off to burp the system. The radiator fan coming on is a good indicator, but mine doesn't get hot enough from idling so I just wait until the bubbles stop coming out.
Torque SpecsWater Pump 9ft/lbs
Alternator Bracket 33 ft/lbs