oil change through dipstick GT40

My '96 with a GT40 has a drain hose at the bottom of the oil pan. A friend has a '97 with a GT40 but no drain hose. It has a threaded fitting on the top of the dip stick although I don't know what it would thread to (it looks like a garden hose thread but larger diameter).

I need to know if the bottom of the dipstick goes to the bottom of the pan or not? If it does, I can suck it out just using the dipstick tube. If it doesn't, then I'd have to snake a hose down the dipstick and hope it bottoms out.

Suggestions? I'm trying to help my friend out and said I'd change his oil and tranny fluid because I have a GT40. But suddenly I don't know how to get it out (all of it).

Thanks in advance,

Gordon

Todd,
Draining in the bilge?? Sounds messy to say the least! I've never had a problem sucking oil via any dip stick hole and that includes my Escort. I've used vacuum oil extractors on hundreds of boats with many different engines way before anyone came up with the idea of putting a drain hose on a oil pan. Are you using the correct size tubing?

Orlando76 wrote: PIA. My ‘76 Escort doesn’t have a drain hose and once I’ve tried sucking oil out the dipsticktube. Best I could get was maybe a quart. Does the GT40 have an actual drain plug in the pan? My Escort does so I take garbage bags and lay them in bilge, tape them everywhich way then I slowly pull the oil drain plug and let oil fill the lined bilge and then I suck it out the liner.

Maybe next time you drain it, you should put on a drain hose kit

slmskrs wrote: It has a threaded fitting on the top of the dip stick although I don't know what it would thread to (it looks like a garden hose thread but larger diameter). Gordon

Oil extractor with garden hose adaptor

Use a small suction hose.

Pressure = Force / Area

fanofccfan wrote: KENO wrote: Orlando76 wrote: PIA. My ‘76 Escort doesn’t have a drain hose and once I’ve tried sucking oil out the dipsticktube. Best I could get was maybe a quart. Does the GT40 have an actual drain plug in the pan? My Escort does so I take garbage bags and lay them in bilge, tape them everywhich way then I slowly pull the oil drain plug and let oil fill the lined bilge and then I suck it out the liner. Maybe next time you drain it, you should put on a drain hose kit I tried to find a fitting to replace the drain plug on my 318 and came up empty. Would love to replace to conglomeration of home made funnels that I use now!

Summit says the LA had a 1/2-20 plug... which I believe is the same size as the older ford/gm kit that SkiDIM sells.

You're missing 1 quart somewhere.

Tube Fitting

This is the universal that can be had in different barb sizes. Also, probably can source at home improvement store if needed.

Yeah, 351 from the beginning of time is 5qt capacity. There is 1 dirty quart of oil remaining in your pan.

4 quart pan roughly 1 in the filter. Pretty standard across the board for factory small blocks from the big 3 mfgs.

Your dipstick is probably wrong (have seen it plenty). May have something to do with a threaded style dipstick too? not sure where that style enters the pan.

Maybe that guy who did the oil pan capacity test should do one with oil removal. Maybe when it gets warmer??
I do know that "PCM" 351 pans, which are really a Ford provided pan are the same from the late 80's up. I just found one on Craigslist back home that was a new take off from a crate engine. Same exact pan except for a built in windage tray--- 20 bucks, 3 miles from the house.

Every single 351 I've done an oil change on shows 5qt perfectly on the dipstick with the filter full. (if the dip stick is correct). Regardless of what is correct, he is missing 1/2-1 quart in that engine.

I measure oil level with the boat floating in the water usually or try and mimic floating angle on the trailer.

I have a 351 pulled apart currently. I could measure the length of the dipstick relative to the marks.

TRBenj wrote: Summit says the LA had a 1/2-20 plug... which I believe is the same size as the older ford/gm kit that SkiDIM sells.

Bill

I believe that what Tim believes is right and the SkiDim kit for older Fords will work

Chrysler used 1/2-20 till the late 80's at least on their V-8's and I doubt that their marine/industrial engines used anything different.

With a little shopping you'll probably find a 1/2-20 kit for quite a bit less than what SkiDim charges.

My 95 and my older 78 Nautique have the traditional drain hose and it works well with warm oil.
We had a 87 Malibu with the Chev 350 and it was mounted very low to the bottom and the oil drain bolt could not be removed without taking the bolts out of the motor mount and lifting the engine an inch. That was a PIA so I bought the oil pump to suck oil out of the pan using the 1/4 inch hose. Worked fine but I always hated it. Mine was powered by a 1/4 inch drill. I always felt this method leaves a little of the dirty oil still in the pan bottom but like your boat I had no choice.
You can always waste a quart of clean oil and pour it in the top after the first drain and pull it out after it drains all the way down to see if it comes out clean or soiled.