finding a trustworthy iron head mechanic
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Stage IV
Joined: Oct 2009
Posts: 4
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finding a trustworthy iron head mechanic
Anybody have a recomendation for a trustworthy iron head mechanic? I have a 1969 Then Came Bronson replica that needs some engine work (oil leak) and need a recomendation. I live in Arkansas, so hopefully there is one around here somewhere. Check out www.jimbronson.com
Thanks
Thanks
Stellar HDF Member
Joined: Feb 2006
Posts: 3,035
Likes: 17
From: Houston Texas
Anybody have a recomendation for a trustworthy iron head mechanic? I have a 1969 Then Came Bronson replica that needs some engine work (oil leak) and need a recomendation. I live in Arkansas, so hopefully there is one around here somewhere. Check out www.jimbronson.com
Thanks
Thanks
What kind of oil leak problem do you have?
Consider fixing it yourself would be my recommendation.........
pg
Road Master
Joined: Aug 2006
Posts: 751
Likes: 6
From: 500 miles south from Artic Circle
Agree this this isn't "space technology" most you can deal with normal tools...
Here's one recommended by a member of another forum ...
USA, AR, Fayetteville: Happy Trails M/C Connection, Ask for Joe
To isolate an oil leak, first thoroughly clean the area then shove paper towels into suspect places; then let sit overnight ans/or go for a short ride. Then examine the p towels. Repeat to isolate more closely.
Post pics of the area for more guidence.
USA, AR, Fayetteville: Happy Trails M/C Connection, Ask for Joe
To isolate an oil leak, first thoroughly clean the area then shove paper towels into suspect places; then let sit overnight ans/or go for a short ride. Then examine the p towels. Repeat to isolate more closely.
Post pics of the area for more guidence.
Last edited by IronMick; Oct 27, 2009 at 05:44 AM.
Thread Starter
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Stage IV
Joined: Oct 2009
Posts: 4
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Thanks, The oil leak appears to be coming from the split in the cases, directly under the engine. There is some silicon along the split that is coming off. I drained the oil months ago and it still leaks, got to be draining down from the rocker boxes?
Stellar HDF Member
Joined: Feb 2006
Posts: 3,035
Likes: 17
From: Houston Texas
A true oil leak coming from the crankcase halves would be caused by the crankcase halves not being entirely sealed when they were bolted together. Or have become 'leaky' over time.
If oil were leaking from the rocker boxes (or anywhere else for that matter) it could run down the outside of the engine and collect on the bottom of the crankcase to drip on the ground.
Because you find silicone on the bottom of the case however, this indicates someone has vainly tried to seal the leak.
This will never work. The only way to fix a leak between the case halves is to remove the engine and completely dis-assemble the entire engine.
This is a major thing and will cost more that $1500 to have it done.
The only suggestion I can make is for you to live with the leak, unless you have the money to repair it.
Doing this kind of repair yourself is going to be very difficult if you have never taken a Sportster engine apart before.
Not impossible.....but very difficult, so I suggest you not entertain thoughts of doing that.
Spray the bottom of the engine with Simple Green once in a while and hose it off. Keep an eye on the oil level in the oil tank too.
There are only a few ounces of oil in the bottom end when the engine is running as the oil is continuously pumped throughout the engine.... from the oil tank...through the engine.....and back to the tank.
When you shut off the engine, a few ounces remain in the lower end.
Some of this oil is in the rocker boxes and drains down inside the pushrod tubes, and also drains from holes in the heads down a passage inside the cylinder walls which exits into the cylinders about midway down.
Then the oil drains down the cylinder wall and drops into the lower end where it sits until the next time the engine is started when it is pumped back to the tank. This is a very small amount of oil we are talking about.
This is the oil draining out through the leak as the bike sits.
The only other thing that can cause oil to load up inside the bottom end is if the bike has sat without running for a long time.
Through the force of gravity oil in the oil tank can (and usually does) drain past a ball check in the pump and deposit in the lower end.
Also, there is a transfer valve in the left hand crankcase that will allow the excess oil to flow over into the primary and transmission.
My bike has sat without being started for 18 months and last week I got it running again.
There was no oil in the tank, no oil built up in the lower end......BUT there was better than 2 quarts of oil inside my primary and transition. This drained down through the route I just described.
A sure sign of excess oil in the lower end is when you crank the engine and oil pukes out the breather tube. That means excess oil is in the crankcase.
pg
Cruiser
Joined: Jun 2009
Posts: 217
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From: Summerville,SC
In an attempt to drain the oil from the crank case, do NOT make the same mistake I did.There is a plug towards the front of the crank case. DO NOT pull this plug. It is actually ,just a hole used in machining the case half. The aluminum there is very weak and could strip out very easily, resulting in a permanent oil leak. That is until the halves are split,counterweights and crank pin are removed in order to repair the case. I got lucky, but I'll never take that chance again. He other guys on here can probably clarify a little more than I can.
Congrats on your new ride!
Congrats on your new ride!
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Road Master
Joined: Aug 2006
Posts: 751
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From: 500 miles south from Artic Circle
Front in engine, middle of case there is plug DO NOT EVER OPEN IT !!!!!
Rear in engine, middle of case there is transmission fluid drain plug ( no need to use)
Rear in engine, primary side there is primary fluid drain plug THIS IS ONLY plug that has actual use.
I haven't seen any ironheads witch have oil leak between engine case halfs, oil leak has ALWAYS been somewhere else. As PG wrote
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Stellar HDF Member
Joined: Feb 2006
Posts: 3,035
Likes: 17
From: Houston Texas
There is 3 "drain plugs" under ironhead engine, if you look from right ( cam cover ) side of bike under engine :
Front in engine, middle of case there is plug DO NOT EVER OPEN IT !!!!!
Rear in engine, middle of case there is transmission fluid drain plug ( no need to use)
Rear in engine, primary side there is primary fluid drain plug THIS IS ONLY plug that has actual use.
I haven't seen any ironheads witch have oil leak between engine case halfs, oil leak has ALWAYS been somewhere else. As PG wrote
Front in engine, middle of case there is plug DO NOT EVER OPEN IT !!!!!
Rear in engine, middle of case there is transmission fluid drain plug ( no need to use)
Rear in engine, primary side there is primary fluid drain plug THIS IS ONLY plug that has actual use.
I haven't seen any ironheads witch have oil leak between engine case halfs, oil leak has ALWAYS been somewhere else. As PG wrote
This plug was used beginning in 1974 or 1975 and later. It can be bad news if it is removed too, as most of us know.
pg
