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Drill/tap hole for block heater

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1 Dollar

12-07-2006 16:39:32

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I bought a block heater from Sharp's that is 3/4 pipe thread & it screw into the bottom of the head. The drain hole on my head is 1/2 pipe thread. It looks like plenty of room to drill & tap a hole for this heater. Wha do you think?

From this picture which I took about 30 min. ago it looks like there is an insert. Anybody else see that? How could I remove it if there is indeed one in there that took it from 3/4 down to 1/2? This is the first time that I have seen this. I'll look more this weekend, no time now, homework.

Thanks

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Mike M

12-08-2006 06:44:10

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Re: Drill/tap hole for block heater in reply to 1 Dollar, 12-07-2006 16:39:32

Those holes should allready be 3/4" NPT someone could of sleeved it maybe when they put that patch on the side ?

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F-I-T

12-08-2006 08:53:24

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Re: Drill/tap hole for block heater in reply to Mike M, 12-08-2006 06:44:10

Looks like they just brazed in a fitting containing 1/2" threads. Probably had the old threads eroded, so this was an easy fix while they had the head down for welding. You could probably drill in the old sleeve, try to re-thread it up to 3/4" tapered pipe, and if it breaks loose, you'll have to deal with repairing the original threads at that point.

I think you'll be disappointed with the block heater. There is so much coolant and so much exposed cast iron, those engines are very difficult to get warmed. Hanging a 400W flood lamp beneath them and tossing an insulated, fire-proof blanket over the top seems to be more effective, at least in my experience.

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fred45

12-09-2006 17:29:38

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Re: Drill/tap hole for block heater in reply to F-I-T, 12-08-2006 08:53:24

There are at least 2 styles of block heaters. Some are designed with low wattage to keep the engine warm after it has been running and you know you will use it soon/daily. The other type is high wattage (mine is 1500 watts) and should be used if your tractor is not run on a regular basis. My 820 Mannheim engine will start in 30 minutes after being plugged in. It works much better than any bulb and blanket.

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