The Craftmans Shop > PowerSports
1954 Ford 850 Tractor w/blown Head Gasket (at the very least)
vtsteam:
Hi Mattinker:
That's what I was thinking -- I even have some nice new water hardening 1/2" drill rod (silver steel)
Here are the three exhaust valve caps that I have.
I'm starting to wonder if there actually were 4 on this tractor when I got it. I just noticed that one of the valve pushrod ball ends is dirty and varnished over, while the other 7 are shiny. Was that rod even contacting?
The dimensions of these rotators are:
OD .475" (all)
ID .350" (all)
Length .311" (2) .305" (1) (length gets adjusted per valve when fitting -- probably all started out .3125")
Cap end thickness ~.040" (all)
When fitting, according to the Ford Service Manual the end clearance inside the cap should be .002"-.004" and you shorten the cap to fit the valve.
Manxmodder:
--- Quote from: vtsteam on May 22, 2014, 07:37:15 AM ---Hi Pekka, I took off a total of .014". I think that will be okay because on an old tractor there aren't many fixed parts that also attach to the head whose dimensions would no longer work. Also I'll know when it comes time to adjust the valve clearance if there's a problem.
Of course the head was already low in the center by .012" and may have been bent down by the head bolts.
So, anyway, I think there's a good chance that there won't be mechanical interference problems. A little more compression maybe. But I'm hoping the additional two cylinders firing I get out of it will be an improvement, no matter what the problems!
--- End quote ---
Steve,I think Pekka may be reffering to the thicker head gaskets that are prescribed when a diesel cylinder head has been skimmed.
These thicker gaskets are used to ensure the bump clearances and compression remain in spec on diesels where compression height tolerances can be fairly tight.
Yours being petrol and in the region of 6:1 ratio isn't going to be negatively affected by 15 thou reduction and the associated rise in compression ratio.....OZ.
Manxmodder:
Steve, I was thinking along the same lines a couple of days back about the missing valve cap and wondering if the missing cap was the cause of the engine not running on all cylinders.
Was the head gasket physically damaged when you inspected it?.....OZ.
vtsteam:
Oz it was blown in the middle between 2 and 3 cylinders. Of course a bad valve could have been in that area, too. Sorry I didn't note what looked like what when I pulled the head and valve gear. The big gasket break was what caught my attention.
I guess if I do end up tryi ng to make another cap, the trick will be the .350" bore and flat face inside. Might have to actually make a rose cutter or something to cut that.
vtsteam:
Had another thought about that dirty pushrod end.....ugh... hope there's nothing wrong with the cam and lifter.
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