Matt Harwood Posted February 7, 2010 Share Posted February 7, 2010 I had a similar thing happen myself. Strange thing was, after pulling the head off, it turned out that one of the valve seats had dropped out. Luckily it was caught by the valve and wedged back into the cylinder head. Damage was totally confined to the head. Being honest, I'm a big fan of RLTC, and I had it on my car for 8 years, equating to around 40-50,000 miles in total. Never had any issues with engine damage, and believe me, I used it! For what it's worth, IMHO, a built engine is only as good as the builder. I had a built engine in my car, built by Mig. I would like to say I helped him build it, but in reality, I just helped bolt bits together. He was very anal with clearances tolerances and cleanliness. That engine never missed a beat. Good luck with your findings. Hopefully, as in my case, it won't be too bad. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 7, 2010 Share Posted February 7, 2010 Once the head is off if I get pics of the said items is it possible to tell if the damage is confined to the head, or should the block be sent to an expert to check? What are cotters? http://www.ms-motor-service.com/content2.asp?area=hauptmenue&site=produkte&cls=02&changelang=&pcat=9 Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 Well made some more progress today. Stripped pretty much everything out the way ready for the head removal. Hodge came over & lent me a hand which I really appreciate First off, as I was stripping stuff off the car, by chance I noticed that some of the exhaust cam bearing cap bolts were loose!!!! Hodge arrived as I was about to start removing the cams, we took the gears off & were about to start removing the cams when John said that the exhaust cam was snapped. Once the cams were removed we hit the next issue, I have ARP head studs, that means imperial, we didn't have a deep reach imperial 1/2", the 13mm fitted the outer studs, but not the inner ones. So it basically halted play until I get some this week. One other thing I noticed, the back of the throttle was covered in petrol. I dodn't know what I'm looking for but John said that it didn't look like it had dropped a valve from where we were. What does this mean in terms of the low compression on cyl 1, if it's hasn't dropped a valve does that mean problems with the piston? Before John turned up I went over each bearing cap & took a photo (thought it may help), lucky I did , here you can see the exhaust cam totally snapped & seperated from the other half Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 Also would a snapped cam account for the noise? or is something more sinister waiting when the head comes off? Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted February 7, 2010 Share Posted February 7, 2010 HKS cam Jay? Quote Link to comment Share on other sites More sharing options...
JustGav Posted February 7, 2010 Share Posted February 7, 2010 Also would a snapped cam account for the noise? or is something more sinister waiting when the head comes off? snapped cam would 'possibly' be down to a valve getting bent/stuck. Seen it happen on renault engines. Quote Link to comment Share on other sites More sharing options...
captainchaos Posted February 7, 2010 Share Posted February 7, 2010 sorry to hear about it, how come bad things happen when you have just fitted a new toy? Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 HKS cam Jay? Yip HKS 264 snapped cam would 'possibly' be down to a valve getting bent/stuck. Seen it happen on renault engines. Ahh right, I'm thinking the loose bearing bolts isn't good either Quote Link to comment Share on other sites More sharing options...
Dnk Posted February 7, 2010 Share Posted February 7, 2010 Loose cam bearing bolts sounds like the cause of your problems and almost definetly why the cam has snapped. How loose exactly were they, finger tight or worse ? and how many ? if one on the end was loose then the cam would snap as there not very good at bending Sorry to be reading this jay you must be gutted mate, hope it all turns out good in the end Quote Link to comment Share on other sites More sharing options...
JustGav Posted February 7, 2010 Share Posted February 7, 2010 Yip HKS 264 Do the 264s move the engine into interference territory? Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 Loose cam bearing bolts sounds like the cause of your problems and almost definetly why the cam has snapped. How loose exactly were they, finger tight or worse ? Sorry to be reading this jay you must be gutted mate, hope it all turns out good in the end Les than finger tight! Cheers Dunk Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted February 7, 2010 Share Posted February 7, 2010 Yip HKS 264 They are hollow cast and as such can snap really easily. Remember mine? Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 Do the 264s move the engine into interference territory? Not sure, but the compression test on 6 was the same as 5 to 2, so looks like the valves stopped in the up position. What happens to a cylinder if the exhaust valves stick closed. Does it fire? Or does it just spew unburn air/fuel mixture back into the intake? Is that why I have petrol on the throttle butterfly? Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 They are hollow cast and as such can snap really easily. Remember mine? Yip, "installers" have snapped 2 in mine when fitting them, never had one snap in situ though Quote Link to comment Share on other sites More sharing options...
JustGav Posted February 7, 2010 Share Posted February 7, 2010 What happens to a cylinder if the exhaust valves stick closed. Does it fire? Or does it just spew unburn air/fuel mixture back into the intake? Is that why I have petrol on the throttle butterfly? Sounds plausible... Afterall, it has to go somewhere Also if the intake valve is stuck, on the compression cycle it could leak back and contaminate the intake. Quote Link to comment Share on other sites More sharing options...
Dnk Posted February 7, 2010 Share Posted February 7, 2010 (edited) Les than finger tight! Cheers Dunk I take it the ones where the cams snapped are the loose ones ? Not good mate but at least this could be just a head required and not the whole motor, fingers crossed Have you checked any of the cam journal bolts with a torque wrench ? inlet as well as exhaust to see if any have been torqued up to their correct ftlbs Edited February 7, 2010 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Nic Posted February 7, 2010 Share Posted February 7, 2010 (edited) Do the 264s move the engine into interference territory? No The only after market cams I know of that cause the engine to interference are the JUN 272/10.8mm lift Edited February 7, 2010 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted February 7, 2010 Share Posted February 7, 2010 thing is you dont want it happeneing again! id get a big loan and get a 3.4 sorted (im not trying to put ideas in your head lol) On the plus side if you deside on a 3.4 set up you will have even moreeeeee power and sumin to look forward to mate. Gutted for you that this has happened! same thing happened to my G60 this time last year! Pau; Quote Link to comment Share on other sites More sharing options...
JustGav Posted February 7, 2010 Share Posted February 7, 2010 Pull the buckets and shims off the valves near the exhaust cam snap and make sure the collets are there..... I think CW may be onto something Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 I take it the ones where the cams snapped are the loose ones ? Not good mate but at least this could be just a head required and not the whole motor, fingers crossed They were yes, Thing is why is 1 down on compression, the snapped cam wouldn't account for that would it? thing is you dont want it happeneing again! id get a big loan and get a 3.4 sorted (im not trying to put ideas in your head lol) On the plus side if you deside on a 3.4 set up you will have even moreeeeee power and sumin to look forward to mate. Gutted for you that this has happened! same thing happened to my G60 this time last year! Pau; I'm def going for a stock engine, esp since this is the 1st time I've tried something like this. it's either going to be stock head or stock full engine + cams Quote Link to comment Share on other sites More sharing options...
Dnk Posted February 7, 2010 Share Posted February 7, 2010 thing is you dont want it happeneing again! id get a big loan and get a 3.4 sorted (im not trying to put ideas in your head lol) On the plus side if you deside on a 3.4 set up you will have even moreeeeee power and sumin to look forward to mate. Gutted for you that this has happened! same thing happened to my G60 this time last year! Pau; Didnt Jay say he was scared of the power he'd already got Quote Link to comment Share on other sites More sharing options...
jevansio Posted February 7, 2010 Author Share Posted February 7, 2010 Pull the buckets and shims off the valves near the exhaust cam snap and make sure the collets are there..... I think CW may be onto something Already done this when John was here, everything looks spot on from this side of the head, I will get some pics now as John is gone & I don't really know what colletts look like Quote Link to comment Share on other sites More sharing options...
JustGav Posted February 7, 2010 Share Posted February 7, 2010 Already done this when John was here, everything looks spot on from this side of the head, I will get some pics now as John is gone & I don't really know what colletts look like http://www.mkivsupra.net/vbb/showpost.php?p=2656407&postcount=102 http://www.ms-motor-service.com/ximages/525501_ventilkege.jpg Two little metal units that go round the stem of the valve just near the top of the valve spring. Quote Link to comment Share on other sites More sharing options...
Nic Posted February 7, 2010 Share Posted February 7, 2010 The HKS cams are machined from billet cores, they are stiff and hard wearing but like most cams very brittle. If the caps were lose it would have allowed the cam to bend causing it to snap. Quote Link to comment Share on other sites More sharing options...
Dnk Posted February 7, 2010 Share Posted February 7, 2010 The cam where its broke wont be turning with the rest of the cam so is it stuck and keeping the valves open ? Quote Link to comment Share on other sites More sharing options...
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