I can't drive 55 (1 Viewer)

[BOBWhite74]

I don't remember if my F1.5 had domed or flat pistons but from this pic I think it had flat:

And yes that is not the correct head gasket but I couldn't find a good f1.5 specific head gasket anymore. Keep that in mind! Don't pull the head unless you absolutely have too!

 

[MatthewMcD]

Probably not the problem. But some regular ole. Copper plugs will be plenty fine for your tractor engine. No need for platinum plugs

I replaced the POs plugs with these since that's what he was running. I have regular plugs in my stores.

 

[MatthewMcD]

Something is fishy, my 5/79 40’s head is a 61031.

This is not the original engine. Here is the block stamp: F-258321

 

[Skreddy]

This is not the original engine. Here is the block stamp: F-258321

With that number, looks like a late 60’s F, not “F.5” engine. Now I’m really curious to see a pic of the valvetrain…. How’s the oil getting up there?!

 

[MatthewMcD]

From pics earlier and in other threads, looks like he’s still got the oil fill tube in the block and no provision on the passenger side for oil filter, if I remember right. It very well could be the wrong head.

@MatthewMcD can you post a pic of the engine stamp pad? It’ll be on the passenger side of the block, pretty much right below the timing window. Should be a machined pad with numbers stamped in it.
Also, any pics when the valves were adjusted and the valve cover off?

The video I took after we adjusted the valves is here: I can't drive 55 - https://forum.ih8mud.com/threads/i-cant-drive-55.1347969/post-15666455
Here is the block stamp: F 258321

 

[zerotreedelta]

Bizarre...the math isn't mathing on that combo, a bit of a franken-F.

The plot thickens, but feels like this thread has a little promise.

 

[Skreddy]

That is an F engine and circled is the oiler fitting. It looks like they may have mated the dome piston 2F head to the F block and used the F valvetrain to make the oiling work?

 

[MatthewMcD]

Do you have a boroscope to peek down a sparkplug hole to see if you have domed or flat piston tips?

I don't have a bore scope...yet.

It'll be here tomorrow.

 

[BOBWhite74]

I wonder how many engine's it took to cobble this thing together! Did the head part number change from the F to the f1.5? My f1.5s head is also 60051

Another thing I thought of: did you ever check the fluid in the transmission/diff? I've seen oil turn into tar and I'd imagine that would take up quite a bit of horsepower at high speed.

 

[MatthewMcD]

I wonder how many engine's it took to cobble this thing together! Did the head part number change from the F to the f1.5? My f1.5s head is also 60051

Another thing I thought of: did you ever check the fluid in the transmission/diff? I've seen oil turn into tar and I'd imagine that would take up quite a bit of horsepower at high speed.

I replaced the engine oil, front and rear differential, transmission, and transfer case back in November.

 

[45Dougal]

Amazing, I have not really ruled it out. I cannot remove the muffler without cutting it off because of the way they welded it on to the mount. I could disconnect it at the manifold and wire it up temporarily, but without back pressure is it worth risking HOA complaints for the test?

Maybe could loosen the manifold and vacuum the exhaust through from the back?

 

[zerotreedelta]

For the heads, 60*** should be the original F-series, 61*** was the 2F.

Interestingly enough, the bore also changed from F (90mm) to 2F (94mm), aside from the oiling...definitely a strange combo.

 

[MatthewMcD]

Maybe could loosen the manifold and vacuum the exhaust through from the back?

You mean like a shop vac? I have definitely driven it enough to blow any loose crap out. I was worried about any caked mud that may have gotten in there while it was sitting.

 

[MatthewMcD]

I wonder how many engine's it took to cobble this thing together!

All of them....

 

[zerotreedelta]

 

[45Dougal]

Any difference if you drive with the choke on?

 

[island45]

I have been hauling old vehicles home for over 50 years and as for rodent nests, I have seen some real marvels of engineering. Orange poly baling twine, burlap sacks, fishing line, you name it. All woven together. It's a long shot and probably not the case, but it happens, so I'm going with it. Pressing the 'other' button.

 

[Grayscale]

61030 so what does that mean?

View attachment 3749831

Yep, plugs for the air rail. Did they fit under the F-air cleaner bracket?

 

[mrboatman]

How about the exhaust flapper being stuck closed or partially closed?

 

[BOBWhite74]

That's something that I hadn't thought of, from the video It looks like it has the stock exhaust manifold.

Not sure if it would cause excessive back pressure but every one of these valves I've seen is stuck or rotted out.