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09-08-2018, 08:09 AM | #1 |
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Flathead Cracks:
Can someone tell me if there any signs that show up of a running,driving flathead that may possibly have a crack in the block?
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09-08-2018, 08:14 AM | #2 |
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Re: Flathead Cracks:
The first two symptoms are steam at the exhaust pipe after warm up and coolant in the oil. If the oil turns milky like a milk shake and you have more oil in the pan than is supposed to be there, then coolant is leaking from somewhere.
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09-08-2018, 12:29 PM | #3 |
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Re: Flathead Cracks:
I was just curious on what might be the signs!I have a 1952 F-1 that I have owned for forty years.For the last year or so it seems like it has a small miss fire at idle or I should say it has a little rough idle to it.It runs smooth and pulls good with no miss while driving.It cranks right up when cold even in say 30 degree weather.When it is hot it acts like the starter can barely turn it over like a vehicle with the timing way off.I figured the starter was probably shot because I have never had anything done to it.I took it off and took to shop for rebuilt and the man said there was nothing worn really bad!I have not reinstalled starter yet because I had to pull exhaust manifold off to replace the gaskets(got all the bolts loose without a problem,lucky me)I talked to an old flathead mechnic about my problem and he said right off I had a crack in the block!!!This is why the curious question.Sorry for the long post.
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09-08-2018, 12:51 PM | #4 |
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Re: Flathead Cracks:
What are the plugs looking like? sooty,clean,light brown or tan? How is the water level low ,oily? Pull the fan belt & watch the water for bubbles. Do you notice any water or white smoke out the tail pipe?
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09-08-2018, 02:02 PM | #5 |
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Re: Flathead Cracks:
I have not looked at the plugs in a while.I am not losing any water and see no evidense of water or oil mixing.I use to drive this truck pretty much all the time.I know for a fact,because the speedometer has always worked I have driven her over 50,000 miles.The truck does still have the original wiring and I am thinking this is where problems are coming from.
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09-08-2018, 02:05 PM | #6 |
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Re: Flathead Cracks:
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09-08-2018, 02:28 PM | #7 |
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Re: Flathead Cracks:
Try running some MMO in the gas and/or "drizzle: some down the carb while running. FWIW
Paul in CT |
09-08-2018, 03:25 PM | #8 |
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Re: Flathead Cracks:
Hey,I like that flatjack9.You just might be right on that!
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09-08-2018, 04:38 PM | #9 |
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Re: Flathead Cracks:
Check your battery and cables. If you haven’t changed your starter cable in forty years, check for corrosion at either end..... Mark
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09-08-2018, 05:41 PM | #10 | |
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Re: Flathead Cracks:
Quote:
A good source for specs and procedures is a MOTOR or Chilton's, etc. Manual from the '50's. |
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09-08-2018, 05:52 PM | #11 |
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Re: Flathead Cracks:
I agree with 40 Deluxe, friend had the same symptoms with his 53. Turned out to be leaky valve. Those later blocks weren't blessed with hard valve seats and with today's unleaded gas it put some wear on the valve seats. I'd do a compression check.
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09-09-2018, 11:41 AM | #12 |
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Re: Flathead Cracks:
Well today I went to pull the plugs out of my truck.I went to drivers side and they came out normai with no problem.I went to the pass. side to remove plugs and I thought I was never going to get these four plugs out!!!!I had to use a cheater bar to break them loose and they were pretty much tight all the way out.The threads looked ok on the plugs except one looked like the threads were a little rough.I have never ran into a problem like this before.Believe me I thought something was going to crack or break before I got these plugs out.Now what do I need to do?Has anyone got an answer to why this problem?I have changed plugs probably several times over the years and never had a problem like this!
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09-09-2018, 12:36 PM | #13 |
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Re: Flathead Cracks:
Are the heads both from the car or was the passenger head replaced at some time? Without knowing the history of the engine that’s my first thought
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09-09-2018, 01:00 PM | #14 |
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Re: Flathead Cracks:
The heads are the same (8RT) and never been changed since I had the truck.
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09-09-2018, 02:00 PM | #15 | |
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Re: Flathead Cracks:
Quote:
That blows my theory of a different head with bad threads from laying in the junk pile for awhile. I’m not an expert here so will sit back and read what others come up with Sent from my iPhone using Tapatalk |
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09-09-2018, 05:41 PM | #16 |
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Re: Flathead Cracks:
There are thread chasers for the plug threads. Think I would use an anti-seize when I reinstalled them.
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09-09-2018, 07:18 PM | #17 |
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Re: Flathead Cracks:
I ordered a thread cleaner from SpeedWay.Not sure if this will help or not.I took a plug back out of the other head and it went in all of them fairly easy except one that was pretty snug going in and back out.
https://www.speedwaymotors.com/Spark...aner,2641.html |
09-09-2018, 08:15 PM | #18 |
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Re: Flathead Cracks:
Was there any indication of water presence? Were the plugs clean or sooty?
Bruce
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09-09-2018, 11:17 PM | #19 |
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Re: Flathead Cracks:
Plugs all looked good. No evidence of water.
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09-10-2018, 07:24 AM | #20 |
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Re: Flathead Cracks:
carbon on the threads can make them hard to get out.
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09-10-2018, 09:27 AM | #21 |
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Re: Flathead Cracks:
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09-14-2018, 09:54 AM | #22 |
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Re: Flathead Cracks:
Ok here is an update.I got the thread cleaner I ordered and done good job on plug threads.I installed new H10 plugs, replaced the manifold with all new gaskets,installed the rebuilt starter.Truck cranks much better now.I did retard the timing a hair.I still have this small misfire or a little rough idle.The only other thing I can think of would maybe in the carb?
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09-14-2018, 03:41 PM | #23 | |
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Re: Flathead Cracks:
Quote:
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09-21-2018, 07:34 PM | #24 |
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Re: Flathead Cracks:
I took carb off cleaned and truck runs a lot smoother now.I had some sediment in the bowl.Only problem I noticed now is when I come to a sudden stop the truck just about cuts off.I noticed even going over speed bumps it wants to cut off.What could be the problem here?This is at idle speed when this happens.
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09-21-2018, 09:11 PM | #25 |
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Re: Flathead Cracks:
Float too low?
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09-22-2018, 06:22 PM | #26 |
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Re: Flathead Cracks:
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09-28-2018, 02:21 PM | #27 |
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Re: Flathead Cracks:
OK,I finally found the real problem to my starting issue.I relaced the cable from battery to solenoid.The truck turns over almost like a 12 volt now hot or cold!Thanks for all the help gentlemen.
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