R33 Gtst S1 Loud Knock/ticking On Cold Start

[KnightRiderR33]

hey guys had this problem since last week i start the car in the morning to go to work and for the first couple of seconds i get this realy noticeable loud knock ticking coming from engine bay. ive toped oil and even chacged to a full syn oil after running a high performance mineral 20w-60 now im runing a 10w-40 syb still same problem any ideas? car is fine to drive no los in oil pressure what so ever

[*LOACH*]

hey guys had this problem since last week i start the car in the morning to go to work and for the first couple of seconds i get this realy noticeable loud knock ticking coming from engine bay. ive toped oil and even chacged to a full syn oil after running a high performance mineral 20w-60 now im runing a 10w-40 syb still same problem any ideas? car is fine to drive no los in oil pressure what so ever

Could be the lifters, timing belt bearings or a bunch of other things. Does it sound like this

Another easy thing to check is the timing belt cover, just remove it and see if the sound disappears. If the sound does disappear then the timing belt may be a little loose.

Edited April 8, 2012 by *LOACH*

[DVS JEZ]

Because it only does it when its cold its more likely to be lifters. The tick goes away once the oil pressure has built up.

U could try a engine oil flush to help remove any build up inside the lifters that are letting them bleed down.

But a few people dont like engine oil flushes as they loosen up other foreign material and gunk inside the motor

[Missileman]

I recently did an oil change to Valvoline 10w-40 semi synth engine armor, and to my horror the engine made knocking/ slapping sound on cold starts in the morning. A couple of days later I dumped that oil and replaced it with some really cheap Gulf Western 10w-30 mineral oil, knocking sound immediately vanished.

My RB20DET is low Kms though.

[KnightRiderR33]

hey guys appreciate the feed back. Though i have had the timing kit done about 10K ago and every oild change i do i use engine oil flush. Im using penrites hpr 10 whish is a 10w 50 and the noise is more metalic like its not getting oil back to the top of the engine in time on a cold start once she is warm you shiut the engine off and start it up she doesnt do it any other reasons?

[scotty nm35]

Try changing the oil filter, the anti drain back valve inside it may be leaking.

What brand/part number is it?

[KnightRiderR33]

i dont think its oil filter i explained the problem to a mechanic i work with and he seemds to believe that what im describing is maine end bearings on the way out so looks like my engine is shot

[DVS JEZ]

If the noise dissapears after the oil pressure builds up ie a few seconds after starting then it will likely be the lifters. Try a nissan oil filter as Scott mentioned as these have anti drain back so the filter stay full and helps oil flow when cold.

I always use hpr 10 without issue's on nissans.

If the engine starts knocking at 3000rpm then i would say its big end bearing wear

[KnightRiderR33]

yeah but thats the thing it only does it in the morning and its for like 3- 5 seconds this noise happend out of no where every oil change i do i use a full flush fresh oil filter eith wesfill or ryco mostly ryco after warm up she drives fiine

[StevenCJR31]

I would go with what your mechanic says, sounds like clearences are too big and the motor quietens down when the oil has taken up those clearences. . . time for a rebuild

[scotty nm35]

Mine made that noise when I used the Drift filters. its fine on the current Ryco one but make sure you have the correct filter number as some don't have anti-drain back valves.

If there was a bearing problem you would know about it, and it would get noisier as the oil thinned out. Its much simpler to change the filter than rebuild the motor mate. Perhaps send an oil sample off to get tested? That would tell you how much bearing material is in the oil.

[KnightRiderR33]

thats a good idea mate. =D i have a s1 so use a z142a

[KnightRiderR33]

sorry ***z145a

[*LOACH*]

As I suggested at the very beginning and DVS JEZ has said twice. It sounds a lot like lifters. If the filter doesn't fix it and you have tried removing the timing belt cover (sometimes brand new timing belts will stretch a little before settling down) then check your lifters. It probably isn't the belt as it disappears once warmed up as DVS JEZ said however it costs nothing but a few minutes with tools to check so it is worth trying. It might not even be the lifters themselves but the o'rings on the lifters leaking which is a relatively cheap fix although labour won't be too cheap. If you find it is the lifters do some research on which ones to buy. I don't know about RB25s but for RB30s the Nissan genuine ones are great but expensive. Some aftermarket ones are as good as the Nissan ones and much cheaper whereas some are rubbish and you will have to replace them again. Unless you can get the work done for nothing you are better off replacing all the lifters at once (same goes for the orings).

Edited April 14, 2012 by *LOACH*

[KnightRiderR33]

found the problem.. definantly big end bearings we let the car cool down again and put the car on 4 stilts and started the car whilest i was underneath and the noise is comming from the crank case so yerp big end bearings steven you were on the money. thanks everyone for the input but i guess ill have to fess up and rebuild.

[DVS JEZ]

Is the noise consistantly there at 2500-3000rpm when hot and cold?

I wouldnt be rebuilding the motor until it gets worse. If it does at all.

[Dobz]

Dump the oil and have a look at it, if it's got shitloads of tiny little spots of copper coloured shit it's your bearings.

If it is the bearings you can bet it was the 20w-60 mineral oil that did it.

Unless you start up your car and not touch the throttle for a good 5-10min 20w-60 oil is going to ruin your engine.

Edited April 14, 2012 by Dobz