Question about BMW K 1200 GT Motorcycles

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K1200gt head apparently needs shimms at huge cost accourding to the mechanic it has low compression but it runs beautiful,, no oil loss or tappet noise either, this was at the 100000 Kilometer service. He said there is no adjustment in the shims.

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Well, the shim adjustment must be done, the question is are you too late? I presume that you are talking about valve shims, which is how the valves are adjusted. Valves work their way into the head, over time, and this closes the clearance, when you hold the valve slightly open, the valve and seat get damaged.This is the time to fix the low compression cylinder, as it will only deteriorate more from this point. Likely a valve issue...And it appears that is what your mechanic is indication. NO MORE adjustment means that the valve has worked its way into the head too far. Valve job time. Sorry.

Posted on Jan 22, 2012


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Ford Fiesta Ecoboost2013 50 000km needs engine replaced due to failed compression test.common problem with this model?

Not a problem I have heard about and certainly isn't something Ford products are prone to.

I certainly wouldn't land my customer a bill for a replacement engine on the strength of a compression test. The compression test is a notoriously unreliable method of assessing engine condition and is useful only as a quick and simple check to discover whether further investigation of compression-related components are needed or whether something else is causing the trouble.

In the case of low compression a cylinder leakage test should be carried out in order to pinpoint where the compression is escaping and then armed with that information the repairer should offer the option of repair, the fitting of an exchange cylinder head, the fitting of a short engine, a conditioned or a reconditioned engine and explain the relative costs and advantages of each option.

It is worth noting a condition called tappet jacking can cause a loss of compression and several times I have encountered Ford engines that have suddenly shed carbon from the piston tops which has become trapped under the valve seats causing such a massive loss of compression the engines stopped. The first time I removed the cylinder head but subsequently I poured Red-X upper cylinder lubricant into the cylinders and eventually they restarted and after a few minutes once again ran normally.
One of those vehicles was a taxi and the carbon shedding happened every 40,000 miles...

My Cadillac deville it's making a ticking noise back top left of the engine

with that low mileage will assume its a newer model and not a classic
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ticking noise with low oil most likely the hydraulic tappets
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only older models are old school manual adjusted tappets

any other problems with the caddy
is it being serviced regularly ?
need to check for engine oil leaks or why the oil was low
maybe a oil pump or oil filter check

find another mechanic and get his diagnosis
a cylinder compression test and engine oil pressure test
is done before any engine rebuild would be considered

unless run without engine oil or totally over heated
52 000 miles on any cady motor it is no where near and engine rebuild

the tappets


There is always a better alternative than the dealership as far as costs. They want to put a new motor in a 2003 model? That is ridiculous to me- cost-prohibitive. Find a reputable independent shop. Look for references and customer satisfaction. A used, low mileage replacement engine is a better alternative, probably less than half the cost of a new engine.
There may be an even better alternative, where you refurbish the top end of the engine-the cylinder head and valve train. This is dependent on that a wet-dry compression test supports rebuilding the top end. What I mean by this is a compression test of the cylinders reveals low compression in one or more cylinders, okay. Next, they would squirt some oil (about a tablespoon) in the low cylinders and check compression again. If compression doesn't change, it points to the valves and valve train (the valve guides which wear and could let oil into the cylinder). But if compression is higher in the wet test, then the piston rings are worn and losing compression, and oil gets past them-this would indicate the engine needs a complete rebuild or a replacement is called for. The reason for the wet test is that the oil will temporarily seal around the piston rings and improve compression if the rings are the problem.
If the test shows the valves are the problem (and it is very possible on an engine with only 120K-your bottom end could be fine), then a top end rebuild of the engine is a much cheaper route than any other choices. You may not know this, but often a little oil burning in the cylinders at start-up is nothing more than the valve stem rubber seals are deteriorated-a real cheap fix. The dealership probably won't tell you this. However, with the loss of power, well, that points to something more severe than valve stem seals. So I would recommend the wet compression test, just to check if it is the top end or the bottom end. If it's the top end, you could have the cylinder head reconditioned and motor along for a few more years, trouble free.
Similar to a compression test, a "leak down" test of the cylinders is actually a more accurate method of finding where compression is lost, and it's only a one step test. They hold compressed air in the cylinder and analyze where it escapes to pinpoint compression loss. Loss of compression translates into loss of power. Have either test done before you decide. Find a good mechanic and trust his advice. (Stay far away from dealers. Greed is their motivating factor.)

Won't start, apparently due to low compression. Any easy solution besides replacement?

First verify the compression is below say 90-100psi. A four stroke engine will run on compression technically as low as 70psi, but will dog for power under load. It depends what kid of engine it is, if it's an "L" head which is a single cylinder engine, it should be very easy for someone mechanically inclined to replace the head gasket. I doubt there is enough piston ring wear in something that new.

My car is emitting white smoke from the tail pipe. lots of it

White smoke is an indication that coolant is entering the combustion chamber. This is normally caused by a cracked head, blown head gasket, or both. STOP driving the car immediately or the engine will be destroyed. You will need to have the car towed to your mechanic and have a compression test run to verify if indeed you have this problem. Other symptoms are overheating, loss of coolant with no apparent leak, oil level overfull, air bubbles escaping from radiator, and a white foamy substance on the underside of the oil fill cap. This is extremely serious and must be repaired. Hopefully if you did not continue to drive the vehicle after noticing this no serious damage has been done. The head will have to be removed, inspected, and head gasket replaced.

My 1992 dr650rse has been stood for 4 years and it wont start.i've cleaned out the carb and jets,put in new spark plugs,cleaned the air filter and changed the oil.its got a strong spark and turns over,the...

The three required ingredients for combustion are; fuel, compression, and a spark (at the right time). When you cleaned the carb and the jets, did you hold each jet up to a light and actually look through them? The openings in the jets are very small and difficult to clean after than many years of sitting. Same with the carburetor; it needs to be completely disassembled and soaked in carb cleaner, then blown out with compressed air prior to reassembly.
Also, I would check the compression with a gauge. You need to see at least 140 psi on every cylinder, or it is not going to run, no matter what. If the compression is low, adjust the valve tappet clearances and see if that brings it up.
If you come up with the three required ingredients, there's no way it isn't going to run.

The bike wont start! seems to have good compression, and fire. the timimg mark is lining up at tdc but with a shot of starting fluid i have gotten a flame thru the carb! oh, and the valves have been...

If your XR600 has ever sat for more than just a few months, there's a very good chance that the carburetor is plugged with fuel varnish. This means that the carb will have to be disassembled and cleaned.
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Make sure the air filter is clean and not oil soaked. Also be sure there's nothing stored under the seat that can cover the inlet to the air filter box.
If the bike has been in storage for any length of time longer than about one year, then plan on having the carburetors completely cleaned out.
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Do a compression test. With the choke open (lever down, in the 'off' position) and the throttle held wide open, you should see cylinder compression of at least 140 psi. Anything lower that that will cause a poor idle and power loss. Insufficient valve tappet clearance in the most common cause of low compression.

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