Shims hi just wandering if my golf 1 has shims can i replace them with hydraulic lifters? if not can u pls tell me what there claerences are ,because i hastily removed the then relising afterwards thy not hydraulic.plz help
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Your car has hydraulic lifters. Hydraulic lifters just means that it uses engine oil to control the valve clearances using a bucket and shim arrangement.
Here's a generic image of what a hydraulic lifter can look like:
If the car makes a tapping sound at start up, this points to a problem in the camshaft area - including the hydraulic lifers/shims. Valve clearances are controlled by the lifters and shims. It could also be a worn camshaft - the lobes can become rounded.
Usually, there is no adjustment possible with most hydraulic lifters. Replacement (usually) means you have to remove the camshaft, though I am by no means certain about your particular model.
If you have the tools and ability, remove the rocker cover and have a look at things.
The image above shows a camshaft - the lobe is worn and rounded. When this happens valve clearance is excessive and may lead to a tapping noise. Engine efficiency is also affected.
The image below shows hydraulic lifters (example only..).
The lifter on the left has a 'dished' surface - wear caused by the camshaft or the lifter not being able to 'turn' in its bore.
The usual cause of this is (a) short trips where the engine hasn't had a chance to warm up properly and pump oil to the camshaft area (b) poor oil/infrequent oil changes (c) stuck lifter.
Before you spend money on parts or repairs, first try adding some oil flush to the engine to clear out carbon and 'sticky' deposits.
... follow the instructions on the bottle...
Then change your engine oil and add something like a 'valve train additive' - this will try and quieten the tapping noise.
The (Ebay) link below will give you an idea of what additives are available (and so will your local car accessory shop).
Try the cheapest and easiest first. If that doesn't work .. unless you are confident that you can inspect, diagnose and replace parts .. give a mobile mechanic a call. Those guys are usually quite good.
Both the 2.0 liter 4-cylinder, and the 2.5 liter V6 are overhead cam engines. While all years of the V6 us hydraulic tappets, the 4-cylinder engines varied. From 1998 and earlier, they had hydraulic tappets. From 1999 on, they used shimmed mechanical tappets. Adjusting valve clearance on the later engines is a little involved, and, if you're not familiar with the procedure, it is perhaps best left to a professional mechanic who is familiar with the engine.
You are exactly correct. The lifters are weak and leaking down. Go to your parts store and tell them you are changing lifters and they will give you the lifters and gaskets needed to do it. Its a job you should be able to do in just a few hours. While at the store make sure you get all your torque specs. or you could just pick up a manual.
BAD LIFTERS WILL MAKE A NOISE.IF VALVE LIFTERS AND LOWER SPRING SEALS BEEN REPLACED AND LIFTERS STILL NOISEY.EITHER ENGINE OIL TOO THICK OR ENGINE NEED OIL CHANGE + FILTER CHANGE.DIRTY OIL CAUSE LIFTER NOISE OR OIL PASSAGES IN THE CYLINDER HEAD STOPPED UP NOT ALLOWING LIFTERS TO GET THE RIGHT AMOUNT OF OIL.OR OIL PRESSURE TO LOW DUE TO FAULTY OIL PUMP.OIL PRESSURE SHOULD BE 29 PSI @2000 RPM. TRYING ADDING SOME SEAFOAM CLEANER IN CRANK CASE IF OIL PASSAGES STOPPED UP IT WILL CLEAN OUT OIL SLUDGE.GO TO AUTO PARTS STORE TELL THEM YOU NEED SEAFOAM.AFTER 500 MILES YOU NEED TO CHANGE OIL AND FILTER AGAIN. SEE IF THIS HELP BEFORE SPENDING ALOT OF MONEY .
the valve lifters should be hydraulic and not adjustable on that engine, either you have a clogged oil feed to them, in which case wynns hydraulic lifter treatment will cure it after a few days, or the shims are worn and replacement means using a micrometer or vernier gauge to measure each shim against the specified clearance and then fitting individual bucket shims to each valve to correct the wear, but try wynn's first, its cheap and works well for sticky lifters.
If the 2.5 has VVT (variable valve timing) it may be this unit thats making the noise, not the valves...
It sounds like the hydraulic lifters are bleeding down after sitting for a while... there are ball checks which are supposed to prevent this... Try using a good engine flush (a product that frees sticky lifters) and replace the oil with a good synthetic... Hope this helps...;-)