Gut Check Time

[tls3601]

If I was having another rebuilt Bill Lee BILL@olc4X4.com would be on my short list or Jim C depending on where you live.

 

[imyahucklbrry]

+1 1fz View attachment 1990036View attachment 1990037View attachment 1990038View attachment 1990039

Oh........ THAT is pretty!

 

[cruiserjunktion]

Oh........ THAT is pretty!

The FJ Company - Custom Built For Today's Driver

Authentic classic Land Cruisers, custom-built for today's driver. Build your own FJ40 or FJ43, and view our gallery of completed builds. Modern options, classic Toyota design.

www.fj.co

 

[tstepp920]

Oh........ THAT is pretty!

If I thought the 1FZ + H55F using the custom bellhousing from the FJ Company was close dollar wise that is what I would do.

 

[sambudo]

Mine use to have all the problems yours currently has. It's a 1971 with the original F-engine. It is unknown if it was rebuilt in the past; however, the PO stated otherwise when I bought it (judging by the condition my engine was in, though, I highly doubt it.)

First thing that got adjusted was the valves. A noticeable increase in power but the back-firing continued on and piston #5 didn't really seem to be firing. Also, between the time that I bought it and 8 months of trouble-shooting, I constantly had to re-adjust the valves every 500 miles due to the some of them getting extreamly tight.

Second thing was a carb rebuild. You can do this at home with the small cost of a rebuild kit. Better performance during acceleration. The carb was pretty plugged up. Still some sputtering and popping coming from exhaust.

Third thing was fixing the frozen heat-riser valve on the intake/exhaust manifold. It was stuck on the closed position. When removing the manifold and peering into the side of the engine, you could see that some of the valves had a ton of carbon deposite and sludge. These were cleaned out by poring some diesel fuel, into the exposed valves, and brushing off the grime with a toothbrush. A gun cleaning rod and dry patches were used to pick up the mess left inside. Diesel fuel was left, sitting over night, with the process being done, once more, the next morning.

Manifold was put back together with the heat valve working, sludge/grime removed, new exhaust doughnut gasket, new oem muffler, and new tailpipe were added.

No more backfiring. Valves no longer need to be adjusted every 500 miles due to excessive tightening. #5 piston firing correctly now. Tons of power. The old F-engine is running like a top on ice. I take it off roading every weekend with no hickups or hesitations. Try working on yours first before spending a ton of money unnecessarily.

I was ready to do the same thing as you, rebuild the engine or get a new doner, before my father (who's owned his Fj40 since 88') talked me out of it and helped me along the way. Hopefully this information proves to be helpful. Good luck

Do you still have the F engine? Just curious. Recently purchased 1971 with F engine and deciding what to do with it. I think I'll follow your advise. first check the compression and go from there. Thanks.

 

[DesertFJ40]

Do you still have the F engine? Just curious. Recently purchased 1971 with F engine and deciding what to do with it. I think I'll follow your advise. first check the compression and go from there. Thanks.

Sorry for the late response. Yes, I still have the original F-Engine from 1971 with column shift (actually an October 1970 model). I first checked my compression when I was having all the problems. All pistons were as follows

#1: 110
#2: 110
#3: 100
#4: 105-110
#5: 120
#6: 120


Since fixing all the issues, I haven't gone back to re-check the compression and see if the numbers went up. I know those aren't the best compression numbers, but the engine really has gotten its second wind since then. I'll be happy to answer any other questions you might have. Just let me know

 

[DesertFJ40]

*double post