Question about 2001 CCM 604 RS Roadster

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Oil leak from ccm604 cylinder head

I have the same problem,the bike went into a local dealer 14 months ago,head skimmed by 3 thou and new sealing ring,valves re cut etc,its done 570 miles since and just gone again,as you can imagine they dont really want to know,cost 350 pounds,not sure what to do next i cant keep skimming the head so perhaps break it and give up,any idea on how to stop it leaking please

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  • CCM Master
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Is the barrel surface ok ? if they did the total job then its down to them !! citizen advice people should be able to help also !

Posted on Jan 22, 2014

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Posted on Jan 02, 2017

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SOURCE: cylinder head skim

From my understanding, the combustion area of the head should have a diameter that is the same as the cylinder i.e. 56mm. If you took 0.5mm from a standard head, your squish would PROBABLY be Ok, however, you need to measure this. Its quite easy, poke a piece of solder wire in to the cylinder via the spark plug hole and trap it between the piston and the head by gently turning the engine over with the kickstarter by hand. Remove the squashed solder wire and measure with a set of vernier calipers. 0.8mm is about right and as Elf said, anything below this is getting a bit close. Do this for the front, back and left and right of each cylinder. Reducing the squish only has only a moderate effect on the compression ratio and does not require higher octane fule. I did this for mine and it was fine - so you 'should' be Ok.

Posted on Nov 20, 2008

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Will re torqing the head bolts o na 86 toyota 4x4 with a 4y engine help temporarily with oil in the water ? Im also loosing water but cant see a leak


if the job was done properly , re-torquing the head bolts is not necessary
what is very necessary however is to clean out the stud holes and threads before refitting the head and applying thread lubricant to the stud threads
the problem is when there is oil or water left in the holes before fitting that muck creates a false torque reading
the setting is reached but the head is still loose so re-torquing the studs will sill cause that hydraulic lock situation and the head will still be loose
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Changed my oil today.When I took the cap off to replace the oil,the cap had some white goo on it.What is this?


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2005 Yamaha Enticer 125 dripping oil out of exhaust


Hi, Ryan and the usual suspects are:
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HEAD GASKET SLOW OIL LEAK, HEAD WAS SKIMMED SINCE BEEN TOLD BY VW SHOULD NEVER BE SKIMMED GOLF 1.9DTI 2007 IS THIS RIGHT


if you had a oil leak that is not a reason for a head gasket or skimming the head. now the compression and voluum in the head has changed a lot. all it being a turbo wow :( sorry. those engine leak a lot of oil through the turbo seal

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Its a 2000 cadillac deville the oil motor goes to the radiator what can I do


Engine oil going to radiator is a cylinder head problem.
Either
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2. Cylinder head bolts not tight enough
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Remove cyliner head and pressure test it for cracks. If cracked replace unless someone near you can repair effectively. If not then skim and you might as well do a complete cylinder head service ie valves, stem seals etc. Put back head with new gasket and torque correctly and be surprised with the results.

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Car blowing white smoke but no overheating has had a new cylinder head a year ago done 54.000


is there any coolant in the oil or oil in the coolant. It sounds like a head or gasket problem. Cooling system & oil system are supposed to be sealed systems. If u have add fluids it must be going somewhere. Leaking, burning etc. Good luck, get it checked out.

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Hi, My sons 1997 aprilia started to over heat today, took screw out the side to check oil and it was like milk, Can you tel me cause


Hi Paul,

Unfortunately, when oil mixes with water the oil goes milky and indicates that water has got into the oil. This points to the head gasket needing replacing and the head skimming to make it completely flat again.
Depending on how mechanically savvy you are is to how much it is going to cost to fix. A Haynes/Climer manual could talk you through the dismantling and reassembly. Your local Aprilia dealer will provide the head gasket replacement and your Aprlia dealer could point you in the direction of an engineering firm who will skim the head.

First ask you local bike mechanic, how much it will be for them to do the whole job to weigh up whether it's worth you getting your hands dirty.

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Bike is at 63000km and has now gone in for 3rd clutch. Am not a hard/sand rider, do not wheelie, etc, etc Bought the bike second hand and first clutch was replaced at 15000 under warrantee. Now at 63000...


If all your clutch problems have been caused by oil leaks, make sure the mechanic working on the bike this time installs all new seals in the transmission and the crankshaft seal on the rear of the engine. Since the input shaft is hollow, you must replace both the seals (on each end) as well as the clutch pushrod felt. Check the clutch slave cylinder too as these have been known to leak.

BMW updated the input shaft seals a while ago, so once you get the new seals CORRECTLY installed your problem should go away.

BTW, was the clutch done at 15,000 by an authorized dealer?? If so, there should be some warranty as BMW gives a two year warranty on repairs done by authorized dealers. If the clutch disc is worn out due to abuse, then that is a different story. Might be wise to investigate if you are entitled to some warranty coverage due to the leaking seals.

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My royal star 1996 is burning oil on # 3 cyclinder


What is the compression on the cylinder compared to the other cylinders? It should be within 10%. Some causes can be - as you suggested - the valve stem seals. Also, the sleeve could be rusted, as the valves could have been open on that cylinder. Generally speaking, on a 4-cylinder motor 1 cylinder has both its valves closed, 1 has both open, 1 has an inlet valve open and one has an exhaust valve open at any given time. Another possibility is that the valve could be sticky - try Wynn's Valve Ease or a similar product.

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