Join Date: Mar 2007
Thanked 134 Times in 130 Posts
The skill level of the Ford dealers employees is reflected in the bid.
I have repaired many - pull the plug and check the size, it may be 2 sizes large when you get it. The last person with a wrench on the plug may not have been the one to strip it, I did one that I am convinced that was stripped by a fired mechanic - the threads came out with the plug. The pressure in the pan is the depth of the oil ( roughly 2 foot to the pound ) plus the crankcase pressure - above 10 inches water colume something is not right. The pressure on the pan gasket is the speed of the oil off the crankshaft.
After you measure the outside of the threads look on a tap drill chart for the next size that will give at least 65% thread and see if a drain plug is made that size, if the hole gives over 85% thread you will need a tap drill. To tap use a socket that will drive the tap, if it is wobbley wrap it with sheet metal or tape so the tap goes straight in and a long extension to get it aimed straight. A little grease on the drill and tap will catch the chips. Or they can be fished out with a magnet.
I used a 1 in cap screw to do a 7/8 in drain plug, used a worn angle wheel to cut a grouve for an Oring, cut it off to length and drilled for a magnet. From the OS moment when it turned free to back to work in the dump about 45 min extra.
There is also a kit to replace the missing threads with epoxy, I would pass on that for a drain, fill is not a problem.
For a helicoil it will need to be cut to length - up to 1/2 thread on the inside, none on the outside. The stripped hole is very close in dia. Tap and clean the threads for Loctite, much easier if it drains overnight. Set the coil and wax the threads on the drain plug so it will come back out without the Helicoil. Noseize works for wax as well.
In the scrap yard we used the drain oil and I collected the plugs so the engines did not collect water. Sell an engine give them the drain plug, less problems with warranty.
And there is always the rubber plugs while you decide what to do, much better chance of help at the Mazda dealer if you ask the right questions - and the grease monkey will know that the RTV trick did not work. The rubber plug can be put in with a quart or 2 spilled in changing from the stripped to the rubber. I generally see the rubber plugs as a one use plug unless it is in a junker.
93 Dodge /CTD, IC, 518, club cab LE, BHAF, KDP fixed, kelderman air ride
81 Isuzu /C223na, 5spd
Last edited by keydl; 05-17-2010 at 06:53 AM.