smokey 0 Posted July 4, 2008 Hiya guys I'm slowly getting round to putting my Mi16 back together. My flatmate whos supposed to help me isn't, so i'm struggling abit. (this is my 1st rebuild) Anyway i've got the pistons re ringed and put inside the newly honed liners (carried out a QEP) I've installed the liners into the block and they look and feel like there are all level with each other and not protuding much. I've check the spec in Hanyes and in the MI16 rebuild manual thats kicking around on here and as far as i can tell they are in spec. I have a guage that can tell me the heights but its not exactly the same as the one used in the rebuild guide. So not sure how accurate it is I was wondering how crucial is this step? If there's anyone local to me (Chippenham) who can help that would be great. Thanks Share this post Link to post Share on other sites
kyepan 291 Posted July 4, 2008 From my very limited understanding, liner protrusion is absolutely critical for propper head gasket sealing on all cylinders. From what i have read there are methods to check the protrusion under a compressed state.. Perhaps a search may yeald some more information. Share this post Link to post Share on other sites
Sandy 189 Posted July 5, 2008 It is crucial to get it right. You need a good quality straight edge across the liner (seals removed, press down firmly), then feeler gauge between the edge and the block. Share this post Link to post Share on other sites
smokey 0 Posted July 5, 2008 It is crucial to get it right. You need a good quality straight edge across the liner (seals removed, press down firmly), then feeler gauge between the edge and the block. When you say seals removed, do you mean the thin black ones which go round the bottom of the liner lip? I've already put them on and oiled them as descirbed in Hanynes and the rebuild guide, and inserted the Liners into the block as descirbed in the guides. Across all the liners they feel and look to be all the same height give or take the odd 0.01mm which is in specification (think its limit is 0.05mm difference) Its working out if they are sticking out of the block enough or too much which is giving me the problems. (limit for this is only 0.02mm) If anyone can help that would be great, this is a show stopper at the moment Share this post Link to post Share on other sites
matt-k 0 Posted July 5, 2008 Hey im interested in this too! Ive got the head off my rebuilt Mi16 ready to refit a new head after it kept pressurising the water system. Does anyone know how much the liners should protrude with the seals fitted as i dont want to strip the entire bottom end just to measure up? Share this post Link to post Share on other sites
Alan_M 66 1 Cars Posted July 5, 2008 As well as the liners being within 0.03mm of the block, they also have to be within 0.01mm of each other from what I remember. Make sure the seats are clean too, use a bit of scotchbrite or similar on them to clean the rusty deposits from them. I had loads of trouble doing mine, and it turned out my block was distorted and it needed skimming. Share this post Link to post Share on other sites
Sandy 189 Posted July 6, 2008 It needs to be measured with the seals removed to be accurate. Share this post Link to post Share on other sites
smokey 0 Posted July 7, 2008 It needs to be measured with the seals removed to be accurate. I dont see how that would work, surely you need to make sure they are all correct with the seals in? It says in the rebuild guides that you should put the seals on 1st then check liner levels. If i remove the liners now i risk messing up my new seals!! Alan - Yeah i cleaned up the seal seats before putting the new liners in. Share this post Link to post Share on other sites
Alan_M 66 1 Cars Posted July 7, 2008 I dont see how that would work, surely you need to make sure they are all correct with the seals in? It says in the rebuild guides that you should put the seals on 1st then check liner levels. If i remove the liners now i risk messing up my new seals!! Alan - Yeah i cleaned up the seal seats before putting the new liners in. Don't know what rebuild guides you have, but my 'old' Haynes and the Pug rebuild guide says to measure without the seals. Share this post Link to post Share on other sites
jas-E 1 Posted July 7, 2008 I dont see how that would work, surely you need to make sure they are all correct with the seals in? once you install the head and get the engine turning the seals will be compressed beyond what you can have them compressed fitted as new. So measuring the heights without the seals will tell you what the actual height of the liners above the block is, so when you have the seals in and head refitted, thats the height they will sit at. Share this post Link to post Share on other sites
smokey 0 Posted July 7, 2008 once you install the head and get the engine turning the seals will be compressed beyond what you can have them compressed fitted as new. So measuring the heights without the seals will tell you what the actual height of the liners above the block is, so when you have the seals in and head refitted, thats the height they will sit at. Ok cool, looks like i'll be taking the liners out then. Hopefully the seals will still be ok. I did oil them up pretty well so the liners should come out easier than before! Going back to checking the heights. How are yuo guys doing it? and where abouts are you measuring? This is the info i used from Haynes: Liner protrusion above block mating surface - aluminium-block engine only (ie all except 1998 cc): Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03 to 0.10 mm Maximum difference between any two liners: 16-valve engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.02 mm Section taken from haynes: 27If the original liners are being refitted, use the marks made on removal to ensure that each is refitted the correct way round, and is inserted into its original position. Insert each liner into the cylinder block, taking care not to damage the O-ring, and press it home as far as possible by hand. Using a hammer and a block of wood, tap each liner lightly but fully onto its locating shoulder. Wipe clean, then lightly oil, all exposed liner surfaces, to prevent rusting. 28 With all four liners correctly installed, use a dial gauge (or a straight-edge and feeler blade) to check that the protrusion of each liner above the upper surface of the cylinder block is within the limits given in the Specifications. The maximum difference between any two liners must not be exceeded. 29 If new liners are being fitted, it is permissible to interchange them to bring the difference in protrusion within limits. Keep each piston with its respective liner. 30 If liner protrusion cannot be brought within limits, seek the advice of a Peugeot dealer or engine reconditioning specialist before proceeding with the engine rebuild. Thanks guys Share this post Link to post Share on other sites
